diff --git a/app/js/lib/mtproto.js b/app/js/lib/mtproto.js
index 25932bd8..a36a0e68 100644
--- a/app/js/lib/mtproto.js
+++ b/app/js/lib/mtproto.js
@@ -1545,7 +1545,9 @@ angular.module('izhukov.mtproto', ['izhukov.utils'])
             break
           }
         case 'msg_new_detailed_info':
-          // this.ackMessage(message.answer_msg_id)
+          if (this.pendingAcks.indexOf(message.answer_msg_id)) {
+            break
+          }
           this.reqResendMessage(message.answer_msg_id)
           break
 
diff --git a/app/js/services.js b/app/js/services.js
index 0ffb5a84..58c88bec 100755
--- a/app/js/services.js
+++ b/app/js/services.js
@@ -3095,6 +3095,7 @@ angular.module('myApp.services', ['myApp.i18n', 'izhukov.utils'])
       curState.pendingPtsUpdates.sort(function (a, b) {
         return a.pts - b.pts
       })
+      // console.log(dT(), 'pop update', channelID, curState.pendingPtsUpdates)
 
       var curPts = curState.pts
       var goodPts = false
@@ -3387,7 +3388,11 @@ angular.module('myApp.services', ['myApp.i18n', 'izhukov.utils'])
       }
 
       if (update._ == 'updateChannelTooLong') {
-        getChannelDifference(channelID)
+        if (!curState.lastPtsUpdateTime ||
+            curState.lastPtsUpdateTime < tsNow() - 10000) {
+          // console.trace(dT(), 'channel too long, get diff', channelID, update)
+          getChannelDifference(channelID)
+        }
         return false
       }
 
@@ -3398,12 +3403,13 @@ angular.module('myApp.services', ['myApp.i18n', 'izhukov.utils'])
         var message = update.message
         var toPeerID = AppPeersManager.getPeerID(message.to_id)
         var fwdHeader = message.fwd_from || {}
-        if (message.from_id && !AppUsersManager.hasUser(message.from_id, message.pFlags.post) ||
-          fwdHeader.from_id && !AppUsersManager.hasUser(fwdHeader.from_id, !!fwdHeader.channel_id) ||
-          fwdHeader.channel_id && !AppChatsManager.hasChat(fwdHeader.channel_id, true) ||
-          toPeerID > 0 && !AppUsersManager.hasUser(toPeerID) ||
-          toPeerID < 0 && !AppChatsManager.hasChat(-toPeerID)) {
-          console.warn(dT(), 'Not enough data for message update', message)
+        var reason = false
+        if (message.from_id && !AppUsersManager.hasUser(message.from_id, message.pFlags.post/* || channelID*/) && (reason = 'author') ||
+            fwdHeader.from_id && !AppUsersManager.hasUser(fwdHeader.from_id, !!fwdHeader.channel_id) && (reason = 'fwdAuthor') ||
+            fwdHeader.channel_id && !AppChatsManager.hasChat(fwdHeader.channel_id, true) && (reason = 'fwdChannel') ||
+            toPeerID > 0 && !AppUsersManager.hasUser(toPeerID) && (reason = 'toPeer User') ||
+            toPeerID < 0 && !AppChatsManager.hasChat(-toPeerID) && (reason = 'toPeer Chat')) {
+          console.warn(dT(), 'Not enough data for message update', toPeerID, reason, message)
           if (channelID && AppChatsManager.hasChat(channelID)) {
             getChannelDifference(channelID)
           } else {
@@ -3442,6 +3448,8 @@ angular.module('myApp.services', ['myApp.i18n', 'izhukov.utils'])
         if (update.pts > curState.pts) {
           curState.pts = update.pts
           popPts = true
+
+          curState.lastPtsUpdateTime = tsNow()
         }
         else if (update.pts_count) {
           // console.warn(dT(), 'Duplicate update', update)