TP-Link Archer C7 possible ethernet bug

Hello! I have a TP-Link Archer C7 v2 router with OpenWrt 21.02.3. Sometimes (twice a week) the internet connection breaks, and I also cannot communicate with the router through the lan ports, only with wifi. The port leds blink, lan and wan also, but there is no communication. If I restart the network service everything works again. I use pppoe for my wan connection, and if I restart only that interface I can see, that the tx packets increases, but there is no rx packet. So when this happens the whole ethernet ports stop working (lan and wan). Is this a bug? Should I upgrade to 22.03 or downgrade to 19.07?