So my M9 has a nasty habit of freezing far too often. I'll be taking a couple pictures (always on compressed RAW only) and then the 'writing' LED will just keep flashing for 3-5 minutes. I doubt this is a buffer issue, as every time this has happened I've only taken 2 or 3 pictures. Has anyone else seen this issue or know what to do about it? I'm running the newest firmware (1.138)