If your bikes bearings are properly adjusted and tightened and the wheel spins freely there's no great chance of the wheel magically locking up. Poor bearings may wear faster than better quality bearings, but wear makes them looser not tighter.
If your hubs seem OK, they are. If they're sloppy, noisy, make grinding sounds, or don't spin freely have them checked
BTW- Sovos hubs have been used as original spec. on hundreds of thousands of bicycles, where the rules for tracking and reporting failures leading to injury are much stricter than the aftermarket. If there were any issues, we'd know about it by now.
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Last edited by FBinNY; 04-01-11 at 04:17 PM.