I had this happen to me twice today, for the first time I think. Temperature was 5 Celsius, in case that has a bearing.
I recorded a clip then in the play screen I pressed the jog dial in order to scroll through it to select in and out points but as soon as I press the jog dial, the screen turns white and the camera is locked up and needs a power cycle to recover. Obviously by then I've lost my recording.
Edited to add: I've just tried to play the clip I managed to save after those issues occurred and it's corrupt and won't play in VLC. I can't even copy it off the SD card as Windows is saying it's corrupt and won't allow me to copy. This is the same SD card I've used with the Chronos since I got it.
So, out of three attempts to get a clip today, they all failed one way or another so I do need to understand why this is happening before I carry on using the camera.