you know what, just realized there is a really old thread (
http://www.operationsports.com/forum...ina-issue.html) where someone else is seeing the same thing and I think he's right - I was experimenting with running zone defenses today and it happened on 3 separate occasions in 2 games straight. so this doesn't seem like one of those extreme outlier glitches.
another thread on the issue:
http://www.operationsports.com/forum...ed-online.html
regarding your comments. there's absolutely no way this behavior makes any sense. how can a break in the action where i'm standing around waiting for an inbound pass cause my player to lose 20+% stamina? and over a course of a couple seconds? if this is truly the way the game was programmed to "update stamina" then it's broken. it should be updating on a real-time basis.