Question: iphone SE locking itself
I have an Iphone SE. I bought it only over a year and a half ago. I have never dropped it or damaged it it is in perfect condition.
However, recently it has started to act up. It keeps locking itself randomly. I can't watch a video without it locking multiple times, I can't call anyone or it locks and sometimes turns off too.
My phone is constantly flashing. It locks, it restarts, it turns off and sometimes has called the emergency number.
I have reset the settings. Any other suggestions? I can't afford a new phone so any advice would be great!
iPhone SE, iOS 11.2.6