Originally Posted by
cbreze Set it up from scratch as I do all my new devices but bear in mind it has worked flawlessly for about 6 months and this happened out of the blue and no new app installs or anything. I revisited Android for a good year between the 6 and 7, coming back to the 7 later. I can try your reset advice later when I have more time. Thanks for replying.
Since you had 2 phones do that, it's likely not the device. Even though you set it up from scratch, I would advise restoring through iTunes on computer. This would put an absolute fresh copy of the OS on the phone.