Apple store iPhone XS 64 GB in Gold for Unlocked (Constant Reboot) For parts

Product Name: Apple store iPhone XS 64 GB in Gold for Unlocked (Constant Reboot) For parts
XS 64gb gold, it's store unlocked. It has an issue where it reboots every 3 minutes or so. I thought it was the screen so it got the screen replaced, I thought it was water damage but the indicator isn't red, I'm guessing it may be the battery but I'm not 100% sure and don't want to put anymore money into figuring it out because I can upgrade with my carrier for free. I made sure they unlocked it before I listed this. Please don't ask me a million questions about what's going on with it, I'm not sure, I'm not a cellphone repairman. You may have to take it straight to a repair shop if you can't repair it yourself. Again, the imei is clean, the screen is brand new, the back is busted up & the phone will not stay on longer than 5 minutes. It has the latest software update as well. That's all the info I have, the batter health is pictured & proof that it's unlocked is pictured as well. The original carrier was Verizon but you can use it with any US carrier. No offers please, firm price.