The 70D is flaky without ML loaded. Mine froze for no reason. This was after Canon replaced a failed CPU post-warranty for $400 (a known issue with 70D's). All without ever loading ML. The fix for me was to load a fresh card and battery, then switch the ON/OFF button back and forth quickly and firmly. It eventually powered up. Go figure. I also have an 80D with no problems. I recently loaded ML on the 70D to film raw, and I have had no problems since. Good luck.