I bought a new E-M1 about 4 months ago and have shot with it maybe 5 times as it's my backup to full frame. I had an issue where it locked up while shooting a few times and had to power on/off to get it working again. I updated to the latest firmware but have only done a few shots since so hopefully that resolved it. My biggest concern is while I was in the menu doing some wireless flash settings it froze up completely and was stuck on the menu option and I couldn't do anything. I powered on/off but the menu still stayed on the lcd and the only way I could get out of it was to pop the battery. This really worries me and thinking I should send it in for service. Has anyone else had this happen? If it helps the battery was almost at full charge. I have never had issues before with any camera but this really concerns me.