I have what seems to be a very intermittent crackle that comes from my WT800 (mostly) when it's been on for awhile. It crackles and cuts in and out for just a second - then it's fine for a while again, then it does it again. The sound is very much like a bad cord. I've used different chords and basses (including the speaker cord), so it must be an issue with the head. Each episode seems to last approx. 5-10 seconds. Any ideas? My fear is that it's so intermittent that a repair person may not catch it acting up! Any suggestions and advise appreciated! Any similiar problems with other Eden heads? Thanks!