A week ago my iPhone 5 started acting up: slow, laggy, black screen with loading wheel sometimes while using apps, etc. Then, I turned it off and it wouldn’t turn back on. So I connected it to iTunes and did the latest iOS update available (iOS 10.3.3 for iPhone 5, before that it was on the last iOS before that one). I thought bout doing a backup on iTunes and then restoring it to fix the issues, but when I tried to, it said « backup couldn’t be completed because the iPhone disconnected » even though my iPhone kept showing up on iTunes and was connected. I tried on 3 different computers with different cables. I thought about signing out of iCloud and back in, but still no fix. I got an appointment with Genius Bar, and they told me to buy iCloud storage and do the backup on iCloud. I did that, and now when I try to backup on iCloud, it says the backup couldn’t be completed. I’ve reset all settings, reset network settings, I did a few hard resets, etc but I still can’t back up. Any ideas on what to do? What the **** is wrong with my iPhone? I’m going crazy.