This happens to me from time to time. When I'm setting levels before a session, I'll ask whoever's playing drums to whack each component that's miked as hard as they can and then I set each preamp so there's no clipping. Then I'll get them to play the whole kit ferociously and turn everything down a fraction, just to make sure. But once the session has been tracked, every now and then, I'll notice the odd quick spike of clipping. It often surprizes me because I listen to the playback first and I don't notice anything amiss. I know what that awful digital clip sounds like and I don't ever want to hear it again ! So I don't worry at the odd clip if it isn't messing with the sound.