I recently started having a weird problem with my radios. When I power up the radios after engine start, I try to call Ground and they can't hear me (they report garbled/unreadable). After several attempts I can get enough thru to them that I get cleared to taxi to the runway... By the time I get there, do my runup and call tower for departure, the trouble seems to have cleared and the tower doesn't complain about any problem with readability. After the initial trouble there doesn't seem to be an issue with any radio communications. So Monday, my solenoid craps out and its now been replaced. I haven't had the opportunity to check to see if the radios are still having issues yet, but is it possible that the solenoid was putting noise on the ground connection and interfering with the radios.