force restart not working iphone 7
My Iphone 7 started locking up a few months ago but thought id cured it by removing an app recently installed and has been good since (fixed the lock up by force restarting)
Today its locked up again. Was using it and it just froze then the screen dimmed then off. Force restart does nothing, plugging in does nothing, even tried find my iphone (shows offline) and calling it (unable to connect call) to see if anything would happen. All nothing. The phone had over 50% charge at the time. Ive even tried leaving it for 30 mins then and hour before trying a force restart again to no avail. Any suggestions to recover it?
(all online research for force restart not working returns, do a force restart)
iPhone 7