Bots Automatically leave the meeting.

[prajinFM]

We are doing BigBluebutton stress test by sending bots.

Creating a 3 hr meeting ( from apimate, duration parameter = 300 ) , recording on, and in meta_ adding callback url.
And all bots are joined as attendees.
Only moderator can view attendee videos.

In a single BBB server, we created 2 meetings and in each of them we sent 48 bots and 2 humans. In total in 2 meetings, 100 users, webcam on for all users.

CPU and RAM usage of both turn server and BBB server is around 60% ( max ).
CPU and RAM usage of server from where bots are sent is also Normal.

The problem is, bots automatically leave the meeting at around 133-140 mins but those two humans are there with webcam on.
we carried out test for 2-3 times but faced the same problem, bots leaving the meeting after 133-140 mins but humans are there and webcam is also on.

What might be the reason ?