Did a hard reset and stopped working completely

I plugged everything in checked the internet worked, then did a 30/30/30 hard reset, went into the TP-Link GUI (192.168.0.1) and under the system section I went to update firmware and updated to the "factory-to-ddwrt-US.bin", after a few minutes and a couple automatic resets I was in the DD-WRT GUI (192.168.1.1) and went to the Administration tab and then to update firmware again and updated to "tplink_archer-c7-v2-US.bin" which is the 08-03-2017-r33006 beta version on the DD-WRT website

Unplugging, resetting, hard resetting....nothing worked

Within a day, it began to drop connectivity, requiring a hard reset

Reset of the router resolves the issue.

A quick reset fixed the problem, usually for a few days sometimes only for 10 minutes

But it drops the wifi signal at least once a week requiring a hard reset

I have about 2 MB/s download speeds from my ISP that comes through my router, the TP-Link has a good connection displaying a green light, multiple different devices connect (desktop, laptop, smartphone) and all have strong strength signal, yet ALL devices are experiencing slow speeds as bad as 1 KB/s per second

I bought this router back in November 2015 and I t was phenomenal.