How do I fix boot looping iPhone 7+

The last time I was using my phone it was glitching and operating by itself automatically, I checked the phone for any suspicious apps and there weren't any! Its now bootlooping and has glitches were it mentions the phone is discharged and has no power (basically a dead battery) but sometimes it just bootloops, I tried everything to enter Recovery and DFU mode with Finder and third party software (Tenorshare reboot) but it turns out its not responsive and my phone will not react to any triggers (power button, volume up and down buttons) well home button will not obviously work since it locks when the phone powers off