I'm currently on my third Fishman Full Circle pickup. (i) The first one died when some kittens we were fostering chewed through the cable near the adjuster. Meow. No Mix. (ii) The second one failed outright—but in the couple of weeks before it did, the pickup became enormously more feedback sensitive, to the point where it was nearly unmanageable in any sort of loudish performance. (iii) Here's where it gets good. My latest Full Circle has suddenly done the same thing: becoming very feedback prone where it wasn't hardly at all beforehand. No other change in gear. It's still working, but it's a pain. Has anyone else experienced this phenomenon?