I can't say I've had one raise up without me moving it, but, I have had a failure to fire when I didn't get the bolt all the way down.

The other 'common' problem for me is with the lighter trigger pull setting on the varmint Accutrigger. Sometimes it doesn't take much for the safety blade to 'engage', such as chambering a round quickly. It will also do the same if I put too much side pressure on the trigger. Bumping the gun can also 'engage' the safety blade.