Just wanted to share a fix I found for this issue.  Every couple of days or so, my two 9020P adapters will lose connection and display a blinking red/green LED. This was normally fixed by turning the adapter plugged into the router off and on again. However, I recently discovered that if I open the TP Link software, open the settings on the adapter connected to my PC and turn the LEDs on or off, this immediately restores the connection and green LED.

Thought someone might find that helpful.