I was using my EM5 II last night shooting my girls at magic hour and my camera locked up. I had to remove the battery (take the battery grip off) to reset it. This is about the third time that this has happened in about a year and half (since its release). I have noticed that this only happens when I use my Nocticron. It has never happened with my PL 25 or PL 15, maybe a coincidence? I was shooting in A mode wide open on silent shutter AF (shooting into the sun). The other times the lock up have occurred I was shooting in the same modes, but at different times of the day. My firmware is the original since release. Is this something I should be worried about or is this something that just happens and I/we have to live with it? Should I update FW? I haven't updated because I have heard problems happening from doing so. My camera is still under warranty. Anyone else experience this?