5 years later... They changed nothing. Clearly they don't intend to change anything at all. Just dump TP-LINK. What are the best alternatives? I have two Deco M4 that I need to substitute due to this...

I'm having this exact same issue with my Deco M4. It worked well for the last 3 years, but not anymore. I moved to a new apartment and now the wifi speed is half what it used to be, even if I'm...