WiFi-backhaul, as running coax or ethernet is not an option. (I don't think my landlord would appreciate me running cables through walls)
It alternates between solid white, and a pattern of three slow yellow blinks, but I do get connection. I read on another post that it's possible that the RSSI score changes from time to time due to interference causing the yellow blinking. I think so long as I'm getting connection I can just leave it as is for now. It just very odd that is can change from too far to too close with just moving it's physical position so little. And when I move it further, it just exacerbates the issue.
Thanks for all of your help.