Hi gussein
Someone in this thread told that a plain iPhone with no apps has lag if you call. Is that easy. Calling makes the difference. I can predict with almost a 100% of success when i will have lag depending on the calls and their duration that i have made since i last used the camera. More calls and more time spend, more lag, form 3 to 15 seconds.
I think that we should focus on this clue to give Apple an specific issue, easy to generate.
Why some people don't suffer this? Just because they barely call between photos. I checked this with a workmate that swore that never had a lag and when we performed that easy test, it showed a 5 seconds lag.
So I am sure that your apple support guy with an 6s will have lag if he does this test which speed things up:
1) Open camera app No lag.
2) Dial-call 10 seconds-hang. Repetead 10 times. I make real calls. Not only ringing but also spend 10 seconds in line.
3) Open camera app again.
I've just checked this with mobile data off and again a 5 seconds lag. So no iCloud affects neither any data exchange.
This is a quick test that everybody can do in 2 minutes. We don't need to wait 2 full days to check it, so things speeds up and we discard theories.
Even we can show it in a apple store and challenge our genius to do it. If someone knows somebody that doing this test has no lag, please tell us because then we could seek a difference. But at least in 6s it will happen.
I don't have any iphone 6 to check but it would be nice to see if the test behaves in the same way.
So let's do this and then we could open a specific issue in apple' supports saying that every iphone 6s, after some calls in any condition has a lag. Easy to explain. Easy to check.
At this moment, my workmate phone and mine suffer lag after this 2 minutes test. 100%
Thanks guys.