Meetings freezing and audio lag problem

I use jitsi on my server and connect to my react front end app, but meetings have some problem.
I use h264 codec and video bridge also i try use p2p but i couldn’t enable it.
When meetings start 15 minutes work perfectly but after this time video freezing and audio lag problems occured. So i need some suggestions about this problem. I try search some topics about that but i didn’t found good answers. Maybe some people fix like this problems.

Thanks for your advice.