CAPsMAN on routeros7.6 - clients packet drops

Hello
My setup: 4 APs controlled via CAPsMAN from RB5009UG+S+
1x RB5009UG+S+ (CAPsMAN and Router/Gateway) v7.6
3x RBcAPGi-5acD2nD v7.6
1x RBwAPGR-5HacD2HnD v7.6


A few times a day wireless clients connected to either 2.4GHz or 5GHz networks experience network timeouts (can not reach gateway even via ping but do not get disconnected)
APs are connected to CAPs man via IP and they are physically on the same network.
The timeouts do not happen on all devices at the same time, it randomly happens for random devices inside the network.
I ruled out the network issue by making the APs as stand alone and offboard them from CAPsMAN. Moving forward I would like to manage them via CAPsMAN again
Can you help me fix this issue ?

Do we need a crystal ball to find what is your configuration?

There is some change that is showing an odd field under MTU that crept in somewhere above 7.4