Re: A cockup by TP-Link? Never...
Ex TP-Link customer here as well. I had one of their better models for a couple of years and lately I had to reboot every evening, the connections were so slow.
Now I got a much cheaper and more featured Mikrotik hAP lite ac and I am flying. Configuring it is a pain, and I thought I had more than basic networking knowledge, but ultimately I got it working as I wanted it to. Not recommended for everyone, but if you can use Mikrotiks, they have the best value.