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قسمتی که ریسایکرویو صدا زده میشه

agahi_recycler.setOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);


    }

    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        int totalItemCount = mLayoutManager.getItemCount();
        int lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();

        if (totalItemCount > 1) {
            if (lastVisibleItem >= totalItemCount - 1) {
                // End has been reached
                // do something


                if (limit < total ) {
                    if (nDialog == null) {
                        swip = false;
                        if(scroll==0) {

                            if(net==0) {
                                //new NetCheck4().execute();

                                if (limit < total ) {
                                    if (scroll == 0) {
                                        scroll = 1;

                                        limit+=12;

                                        mTask = new home_agahi3_server(getActivity().getApplicationContext(), getActivity(),
                                                limit + "", adapter
                                        );
                                        mTask.executeOnExecutor(mTask.THREAD_POOL_EXECUTOR, "");

                                    } else {
                                        //   Toast.makeText(getActivity(), scroll + "", Toast.LENGTH_SHORT).show();
                                        Log.e("SCroll", scroll + "");



                                    }
                                }else{

                                }
                            }
                        }
                    }
                }


            }
        }
    }
});

متغیر scroll و net رو گذاشتم زمانیکه صفر نبود دیگه کد سمت سرور رو نخونه و زمانیکه متد postexecute   اجرا شد متغییرها دوباره صفر میشن

کد سمت سروور هم زیر

   public  class home_agahi3_server  extends AsyncTask<String,Void,String> {

        private Context c;
        private Activity ac;

        private String state_id;
        private String lim;
        private RecyclerView rec;
        AgahiRecyclerAdapter adp;


        public home_agahi3_server(Context c,Activity ac,String lim,AgahiRecyclerAdapter adp
        ){
            this.c=c;
            this.ac=ac;

            this.lim=lim;
            this.adp=adp;



        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            //swipeContainer.setRefreshing(false);
//            agahi_recycler.setVisibility(View.INVISIBLE);
           // rotat2.start();
            //  agahi_recycler.setOnScrollListener(null);

            lay2.setVisibility(View.VISIBLE);
            net=1;
            lay2.setBackgroundResource(R.drawable.border_bg3);

        }

        @Override
        protected String doInBackground(String... strings) {
            try{
                String data= URLEncoder.encode("get_post", "UTF-8")+"="+URLEncoder.encode("true","UTF-8");
                //  data+="&"+ URLEncoder.encode("state_id", "UTF-8")+"="+URLEncoder.encode(state_id,"UTF-8");
                data+="&"+ URLEncoder.encode("lim", "UTF-8")+"="+URLEncoder.encode(lim,"UTF-8");




                //
                URL url=new URL(MainActivity.url+"post.php");
                URLConnection connect=url.openConnection();
                HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
                urlc.setConnectTimeout(3000);
                urlc.connect();

                errorMessage = urlc.getResponseCode() == 200 ? "Successful Connection" : "Internet Error";
                if(urlc.getResponseCode() == 200) {
                    connect.setDoOutput(true);
                    OutputStreamWriter wr = new OutputStreamWriter(connect.getOutputStream());
                    wr.write(data);
                    wr.flush();

                    //
                    InputStreamReader in = new InputStreamReader(connect.getInputStream());
                    BufferedReader reader = new BufferedReader(in);
                    String line = "";
                    StringBuilder sb = new StringBuilder();
                    while ((line = reader.readLine()) != null) {
                        sb.append(line);

                    }
                    return sb.toString();
                }


            } catch (SocketTimeoutException e) {
                errorMessage = "Connection Error1";
                return "err1";

            } catch (MalformedURLException e) {
                errorMessage = "Connection Error2";
                return "err1";

            } catch (IOException e) {
                Log.e("dddgg2", "dddgg2");
                errorMessage = "Connection Error3";
                return "err1";

            }




            return "";


        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            lay2.setVisibility(View.GONE);
            lay2.setBackgroundResource(R.drawable.bg_cadr_around);
            if(s.equals("err1")){
                Toast.makeText(c,"err",Toast.LENGTH_SHORT).show();
                lay2.setVisibility(View.GONE);
                lay2.setBackgroundResource(R.drawable.bg_cadr_around);
                net=0;
                scroll=0;
            }else {

                // rotat2.stop();
                lay2.setVisibility(View.GONE);
                lay2.setBackgroundResource(R.drawable.bg_cadr_around);
//            nDialog.dismiss();
                nDialog = null;


                //          agahi_recycler.setVisibility(View.VISIBLE);
                JSONArray arr = null;
                JSONObject ob = null;

                //Toast.makeText(c,scroll+"",Toast.LENGTH_SHORT).show();
                scroll = 0;
                try {
                    arr = new JSONArray(s);
                    for (int i = 0; i < arr.length(); i++) {

                        ob = arr.getJSONObject(i);

                        _name.add(ob.getString("title"));
                        _id.add(ob.getString("id"));
                        _body.add(ob.getString("content"));
                        _img.add(ob.getString("img"));
                        _imgs.add(ob.getString("imgs"));
                        _price.add(ob.getString("price"));
                        _color.add(ob.getString("color"));
                        _size.add(ob.getString("size"));
                        _shenas.add(ob.getString("shenas"));
                        _time.add(ob.getString("time"));
                        _expire.add(ob.getString("expire"));
                        _visit_today.add(ob.getString("todayvisit"));
                        _visit_total.add(ob.getString("totalvisit"));
                        _mobile.add(ob.getString("mobile"));
                        _cat.add(ob.getString("cat"));
                        _user_id.add(ob.getString("user"));
                        _menu_order.add(ob.getString("order"));
                        _link.add(ob.getString("link"));


                    }

                   adp.notifyDataSetChanged();


                    net = 0;



                } catch (Exception e) {
                    //Toast.makeText(c,"errors in json",Toast.LENGTH_SHORT).show();
                }
            }

        }
    }

Runnable  رو بهش دادم با کدهای زیر بهتر شد. ولی هنوز بازهم مشکلش هست البته کمتر شده و البته systemClock.sleep هم بهش دادم

if (scroll == 0) {
    scroll = 1;
    Log.e("EEE","eee");
    lay2.setVisibility(View.VISIBLE);
    Runnable runnable = new Runnable() {
        @Override
        public void run() {
            SystemClock.sleep(1000);
            limit+=12;

            mTask = new home_agahi3_server(getActivity().getApplicationContext(), getActivity(),
                    limit + "", adapter
            );
            mTask.executeOnExecutor(mTask.THREAD_POOL_EXECUTOR, "");


           // lay2.setBackgroundResource(R.drawable.border_bg3);
        }
    };
    new Thread(runnable).start();

الان که کار کردم روش فهمیدم به خاطر تصویر هست که داخل لیست هست. تصویر از سرور میگیره و از پیکاسو استفاده شده است  به خاطر همین بعضی موقع قاطی میکنه. برای حل مشکل چی باید کرد؟

Picasso.with(ac).load(url  +this.img_agahi.get(position) ).fit().placeholder(R.drawable.nopic).into(

        viewHolder.imgs_agahis);