iPhone 6s suddenly shuts down / restarts
I have a Problem with my iPhone 6s. Four weeks ago I brought my iPhone to a certificated repair company to implement a new battery. A few days later my iPhone 6s shut down while it had like 70% battery left. It turned on again with 1% left. I did not know what was going on. A few seconds later it restarted again and had like 65% again. It happend serveral times and I decided bring it back to the repair company and tell them whats going on.
They told me, that the battery is perfectly fine. they made 51 charging cycles and told me that it has 97.7% capacity – 1676 mAh of 1717 mAh
So yeah, yesterday I got my iPhone back and decided to delete everything and do a complete reinstall without a backup recovery.
And today, at 46% battery it happened again. It shut down, restarted it 1% battery, shut down again, restarted with 5% battery, shut down a third time and restarted with 41%.
The same procedure. I took 4 screenshots (3 of the battery life and one of the battery condition)
Does any of you guys may know a solution for that Problem?