I have reached out  to this community as my Iphone display gone black and got the solution to keep home and power button pressed. It worked but I would like to know why it went black

I have reached out  to this community as my Iphone display gone black and got the solution to keep home and power button pressed. It worked but I would like to know
1. Why it went black and is there a permanent fix for this
2.Will the IOS gets automatically updated as I feel the IOS was 5 when I got the phone in 2012 december
3.Do you suggest 7.1 for Iphone 4

1. There is no way of knowing. These things happen.
2. The iOS only gets updated when you want it to be.
3. You should always update to the latest iOS your phone will support. Apple do not write the updates to make your experience worse.

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