Hi, i have the same problem, my xt4 freezes at random moments. This happened before and after the software upgrade!
A few times after remote access bu alsof at random moments. Already two times the camera was frozen at power-off, but still consuming battery power. So then my camera becale overheated and battery was empty after a time.
I mentioned this at the sales point already after one week but no reaction.... (belgium).
I am wondering if there are also some people NOT suffering with this problem???