I bought a new router, the Linksys WRT100N router. I have my PC connected with the WMP300N adapter.

UMA on my 8120 went to crap after that UNTIL I set the router to use G-mode only

Has anyone else had an experience like this?

Jim

Yes, N routers do not play well with wifi/uma. Rumor has it that OS 4.5 fixes some of the N router issues, though.