Thanks mate for this. I'm sure it's not battery issues, as I've put in a number of new PP3s and the same thing happens after about 10 mins. I've got two of these bases, almost identical, and the other one is fine. The bass, with the fault, does not die on me but once the volume level has dropped of - say about 20% after about 10 mins - it just stays at the lower volume. It's still perfectly usable but I've got to compensate for this predicted loss when playing. I could live with it but it's just got me baffled as to why this should happen. Very strange. Cheers, Ade PS I've got an old Stingray and someone, years ago, built in a period sliding on/off switch in the pickguard for exactly the same reasons as you've suggested.