compatibility matrix router os AP CPE

Hi,
I’m working over a private wireless network with about 1500 nodes (Mikrotik and essentia ) Sometime ago we decided to upgrade all the mikrotik ap with 6.19 release os
An our customer tells that the least mikrotik cpe (router os 6.37+) presents a noisy disconnection problem caused by malfunctioning between 6.19+ with more recent os!
my question: is there a compatibility matrix between router os (AP and CPE) ?
Thanks in advance and …I apologize for my english!