@Sid14 Having the same issues here, and haven't seen a proper cause and fix identified by TP-Link. I am thinking about returning the devices and go for a different brand if the issue persists.

My fairly new M5 setup is running quite smooth in my house with 1 M5 acting as the main deco, connected with enthernet cable to the router, and the other 2 M5s connected as satellites to the main...