XR500 slow speeds

I had my xr500 for over 1 year now and i recently upgraded to verizon gigabit and would get speeds 1000+ down and up. I had a verizon router connected to the modem and my  xr500 downstairs connected on bridge mode and recieved same high gigabit speeds. Now a week or two ago my xr500 speeds are at 90/90.. It isnt  verizons fault tho, i tested wirelessly and wired on the verizon router and got gigabit speeds. Anybody know what happened to my xr500? ive tried everything i know of so far, even factory reset.