Chosen Solution
I have an iPhone XS Max that appeared fine after a screen replacement. The screen is aftermarket, and the phone now restarts every 4 minutes. Everything seems to work fine in those 4 minutes, battery charged, cameras work, touch works, receives texts, makes calls. Is it just a bad screen? Already tried updating all of the apps and even restored the phone. I have the phone coming back in and will put the original back on to see if that fixes it. Any ideas?
The charging flex cable might have been damaged during screen replacement. Or you can also check the USB IC as mentioned in the repair guide here. A rare case of iPhone X Keeps Restarting - Motherboard Repair
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