I looked through for similar posts and those appear to be over 7 years old, therefore I'll post this. Last year I upgraded from the 10c EVO to the 50c, using it for adventure and dirt bike riding. My wife was using a 20s as intercom for our street rides. The 10c EVO/20s combination started having issues with static on the intercom. I made sure firmware was up to date on both and changed many setting such as HD intercom and never had any success. She was riding with me only a couple times a year so I dismissed it as a faulty 20s. I have now transferred the 10c evo to her helmet this year and we have the same intercom static. Firmware is up to date on both units, and I've tried changing to different settings with no good results. Anyone have any experience with this issue? Thanks in advance.