iPhone 7 rebooting, apps crashing, black loading screen

Hi all.

I've been having mayor issues with my iPhone 7 these past 2 days.

Started with it dying over night when it shouldn't have (went to sleep when it was at 30%).
In the morning I plug it in and charge it up to about 30-50%. Then Snapchat starts crashing, maybe works for 2-3 seconds before just closing down. At that stage I remembered there was an iOS update (11.2.5) which I decide to update to, phone still acting pretty weird.

Of course the update doesn't work and the phone gets stuck on the "support.apple.com/restore/iphone" or something. Alright.. that has happened once before.

I connect it to my laptop and update it via iTunes, but its not able to restore it.. fails 2 times i think. Then I finally manage to restore it. I restore my previous iCloud backup (that was taken the evening before everything started).

After restoring the backup, the phone started downloading all the apps. But it would restart it self every other minute almost. But if I turned off the WiFi then it would not restart until after 5-10 minutes maybe. Sometimes it would stay stuck on the black screen with the loading circle untill i soft reset it with volume down + power button.

Even resetting all settings hasn't fixed it. It's hardly usable at all.

I'm currently resetting it again, clearing all settings and data to see if that will make a difference.

Has anybody had an similar experience?