I'm unable to record any video on my z3+. My camera app launches fine, but when I try and record it becomes extremely slow and unresponsive. When it doesn't crash it records extremely choppy videos that are barely watchable. (please note, this is regular recordings, not 4k). I have the same problem in third party camera apps. I've tried all sorts, forcing the camera app to stop, clearing data, reseting etc. I've just done a factory reset and the problem remains.
Also, I'm unable to download the high res music from the promotion (posted that in another thread).
Together with the overheating issues I'm seriously regretting getting this phone, and recommend others dont. I'll probably be returning it this week. It's a shame because I really liked my Xperia z.