The Z3+ is ancient history now, overheating is an integeral part of the phone. You have two options : Open the phone up and place tin foil along the length of the phone or use an app call Greenify (which puts all apps into hibernation until you use them, and puts them back into hibernation when you finish with them). I am looking at a Nokia 7 Plus. Its only mid tier phone and you can get it in Ireland for €370. It comes with no bloatware and is solidly built, the only downside is the camera. It easily beats the Z3+. If you sold your Z3+ now you could probably get a half decent phone with the Nokia 7 plus.
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