Hmm, not I. Mine is pretty new (spring), but I've put thousands of rounds through it with no issues. The don't wear thin or anything, so I'm assuming either they or the holes were out of spec on yours to begin with. I'd make sure they're free of oil and if they keep sliding out try someone else's SX3 pins in it to see if replacements would help. I've used pins from other guns before when ones have been lost. I'm not sure which would work in the SX3.
2009/10 Season Totals:
and my very first deer, should have done it decades ago