My guy is coming off two procedures for epiglottic entrapment – one last May and a follow-up in November. (Laser first time and scissors the second.) We did a dynamic (under saddle) scope in early November before the second procedure, found nothing (drove me crazy – he’d be all snorky the day before, but not w/the scope in!), but under the standing scope the same day, he was trapping it.
He doesn’t really sound much different even after the second surgery – I hear it mostly at the canter while doing dressage work… the vet thinks he’s flipping his soft palate, but I’ve never had him stop/fling his head/show discomfort. He’s the type to get BTV easily, which I think contributes in a big way. Have never heard him do it while galloping/jumping, though.