RBR50 slow connection upstairs

Hey,

Wifi works perfectly downstairs and I'm getting the advertised 200mbps all throughout my first floor. However, upstairs the connection is slow and intermittent despite having two satellites in both corners of the second floor. The firmware is up to date, and I have tried changing the placements and location of the satelites. Additionally, the router is in a central location and according to my internet provider everything looks good on thier end. I would like to note though that this problem only started occuring a few weeks before christmas. Any suggestions are apprieciated!

Thanks!