Problems with Archer AX11000 router
I bought this router 11 months ago. When I first set it up it was terrific. Now nearly a year later and 3 firmware updates later I am about to throw it out the window or return it for my money back (Costco). It has become slow and requires nearly daily restarts. It occasionally stops transmitting or drops sevices. These problems exist across every device in our house, phones, laptops, tablets, TV's, Alexa's, thermostats, etc. There seems to be no rhyme or reason for it. I have moved its location several times, confirmed consistent power and even installed an APC backup power system. We pay for 1Gbit service, have a Gigabit router and I have never seen speeds (wireless or wired) exceeding 650mbits/s.
I have rebooted hundreds of times, I have changed settings and turned "features" off and still no improvement in performance or reliability.
Are others experiencing this change in service of the router? Is there a fix? I keep reading horror stories from other here that the TP-Link customer service line is terrible. Should I keep trying? Wait for a fix? Or take it back to Costco and take my money and buy something else. I'm really running out of patience and disappointed how the engineers screwed up a well working product with f/w updates. OR has something gone wrong with the device and I should exchange it?
Looking for input. Thanks.