Ok I'm way beyond tired of this problem.
Thought I posted this but look like it didn't post.
System 1 & 2 are both 2 main with 130ish devices
System 3 is much smaller 1 main and 52 devices.
All transferred over Ethernet.
1 & 3 are 10.1
2 is 10.2
All will transfer fine at one point then next time drop devices.
Right now on system 2. Updated from 9.3-10. then from 10 to 10.2. Transferred and all good. Made changes then I get the pic attached
All firewalls are off
Loads spread between both repeaters.
Re activating in a 2 main system sucks. Especially when your in a time crunch.
Sys 1 it happened multiple times with 3 of the 6 WPM