My phone hangs when it is hot

Overheating can cause a variety of problems; preventing your phone from overheating would be the best option. You can try disabling background app usage or unneeded services to see if it helps. If you are using wireless charging, try using a charging cable instead. It is also a good idea to not use the phone while it is charging. If your phone has a case, you can try taking the case off to see if it helps the phone cool down.