1.2/2.5 is focus distance, not IS, so I don't know if there could be a relation there.


Suggestions? You can send it to Canon for a problem that no longer exists in the hope they find the problem if/when they disassemble it, but you might get it back no-problem-found (and after-you-leave). Or you can hang onto it and send it to Canon if/when it acts up in a manner that you can't coax away. Unfortunately it's your call.