No, not sure I can offer anything useful. I still use CH pedals/brakes and they have been very reliable for a long time. Once we took apart the pedals to fix a problem, and once also, took apart the Bravo to fix and reroute wiring to throttles. Other than that, no issues with my hardware. You could try that, or replace the rudder if necessary...
Glad you found the problem though. It certainly sounded as though there was interference somewhere, Happy flying!
p.s. I do also plug all flight controls into the Motherboard and only have peripherals such as X-touch and EFIS/FCU and Headphone dongle on USB Hub.