Since upgrading from my trusted Xperia 1 iii to the 1V, been finding that overheating has been a major issue, especially using either of the Pro camera/video apps, literally a minute open and the orange temp guage shows on screen, shortly followed by the message it's overheating and to shut off camera app which it automatically does within seconds. This despite being in a cool room and not overusing the apps. 

While running checks, found that despite phone sitting in stamina mode at 89% battery, expected battery time remaining was 4hrs 50 mins, with only light web browsing and checking camera app working, seems to be a major issue for a new top end handset. Contacted mobile company who've said to keep eye on it if I want or just replace handset free of charge. Going to monitor it over next week before making a decision, right now the camera is main reason I purchased the phone, so hopefully it's easily resolved