OCTO configured and working . but few users facing issues of ICE Failed and disconnection

Hello All,
I have configured Octo and its working as I can see my users are distributed among all the available JVB containers. But one user are connecting to the meeting, few of them are facing issues like “Unfortunately disconnected” and then reconnects again and again.

The browser console is showing ICE e2e ping failed and sometimes it shows below error

<Object.getGlobalOnErrorHandler>: UnhandledError: Uncaught TypeError: Cannot read property ‘connectionTimes’ of null Script: https://meeti.example.in/libs/lib-jitsi-meet.min.js?v=4289 Line: 10 Column: 182267 StackTrace: TypeError: Cannot read property ‘connectionTimes’ of null
at ie.getConnectionTimes (JitsiConference.js:2344)
at h._playCallback (JitsiRemoteTrack.js:213)
o @ Logger.js:154

Note:- If we do have only max 2 JVB running then the meeting is stable else it throws the above error.
Please help me if someone has any solution for this.