My 9100 started randomly popping this morning. Nothing has changed in the placement or what is hooked up. The pops are quite loud, causing full excursion of the speaker drivers. I've never experienced this sort of thing before. The only component hooked to the amp is an Aune T1 DAC. The amp is stock. No alterations, replacements, or upgrades have been made. The unit can go as much as an hour without popping, or it will produce two or three fairly close together. Any thoughts? Occurrance is unpredictable.