My iPhone 11 got run over by a car and I replaced back and front housing (twice, because I dropped and cracked it again) and everything works except that the phone shuts down and then turns itself back on every few minutes (only after the second repair, was fine with this when cracked before the second repair). I went back in and the battery connection to logic board seems solid. I unplugged and plugged back in. No improvement. I was advised to replace to docking station so I did, no improvement. Any thoughts on what it could be?