I have an A6500 that did this. The only access to menu via movie setting on dial. The problem occurred twice and seems related to a new SD Card. All fine until it fills up a bit then problem occurs. Card is SanDisk Extreme Pro U3 128GB 170MB/s. Still have to go through reset nausea but problem goes away until I use the card again and it fills up. Bought to record fast rate for slo mo video.