This was Norm's post, but thank you. I'll give this a shot.

I have done the factory reset multiple times. The RT-AX55 has not fully come back for many since the mandatory firmware push. This is not a two person issue, this is happening to many, many people around the globe. Many people simply bought new route...

I also am still having issues with that router. Many people online are still having issues with that specific router since the update. Hmmmmmmm