I think I have missing resistors.
I replaced the screen on my 5s and now it restarts randomly, sometimes it will go to a blue screen then restart. Also the battery percentage will change after it restarts. After looking at the logic board it appears that there are resistors missing from around the battery connector. I have looked around for a picture similar to mine but have only found pictures of iPhone 4, 4s, 5, and 5c.
Is this a good question?