If the problem is interference
on the vesper, changing the router won’t help unfortunately.
Here’s what I’d try- both hail marys:
1. If you’re using an external GPS
antenna, I’d disconnect it and see what happens.
2. Try building a quick and dirty faraday cage out of screen
foil and see what happens. Given how close the router is to the vesper, a cheap
faraday cage should still allow the connection to the router. Hopefully, it will block enough of the interference
from the radar.