Iphone 7 - Camera freeze on the launch

The native camera app of iphone 7 is taking 5-20 seconds to launch.

To reproduce the issue:

1) Open the native camera app.

2) Close the native camera app by pressing a home button (important: do not delete the camera app from the recently used apps in multitasking).

3) Make 5 calls or more, each call 10 sec duration or longer. E.g. call your voicemail to simulate a day calls.

4) After making the calls, open the native camera app from the lockscreen.

The video below demonstrates the issue:

https://www.youtube.com/watch?v=tnhVNhjxfcI

In this video it is 5 seconds freeze on iphone 7 (seen on 1:42 of the video). The camera freeze is related to the amount and duration of the calls, more calls - the longer it takes for camera to launch. The freeze can go up to 20 seconds.

I experience this issue on iphone 7 (ios 10.0.1) and on iphone 6s (from ios 8 to ios 10).

I have very strong reasons to believe, that all iphones 7 and 6s are affected by this bug and it can not be fixed by rebooting, resetting, DFU, new apple id or phone replacement: I tried to do all these steps many times with my iphone 6s and it did not help. This issue can be addressed only by Apple developers.

Please submit this bug to Apple directly under the following link (as it seems that they do not react to our discussions forums): http://www.apple.com/feedback/iphone.html

This thread is designated for iphone 7 and 7 plus.

The same camera problems with iphone 6s are discussed in the following big thread since October 2015: iphone 6s camera lag

The purpose of this thread is to share and spread out the issue, as well as make Apple notice and react to the concerns of its users by fixing this bug.