@mrvaggos 

Good day,

Thank you very much for your time and patience.

In case there is any mistake, could you please help me check the following information:

1. RE455 only connected to the main router via 2.4ghz, no 5ghz, right?
2. The instability only happened to Ethernet connect and 5ghz connection of RE455, no problem for the 4ghz?
3. Would the 2.4ghz LED turn off on the RE455 when the connection lost?
4. May I know the model number of your home router?

By the way, when the connection dropped, how did you recover the connection?

Please make sure that you have the latest firmware;

Then please also try to change the wireless channel of the home router to be channel 1/6/11 for 2.4ghz;

Thanks a lot.