Orbi Satellite disconnets when streaming video

I have an RBR350 with four RBS350 satellites. My LG TV is connected by RJ45 to one of these Satellites which in turn has a wired connection to the Router via a switch. When streaming videos from my Synology NAS or from BBC iPlayer, the RBS350 randomly drops out of the network and resets. This happens with both 1080p and 720p videos. I have swapped out the Satellite but the problem persists. Last night it dropped out three times while trying to watch a 20 minute program. It has been happening occasionally over the last six months, but recently it is getting much worse.
It has firmware V4.4.1.29.

Is there a log file anywhere on the system that I can download to see what is causing the dropout?

Help please, it is driving me crackers.