iPhone SE panorama

Hello.

I have just switched to iPhone 5 SE from 4s.

I have to admit that i am satisfied from my upgrade in general.

My only problem i would say, is with the function of the panorama. On my 4s, once i locked the exposure,it kept it unchanged!

With 5 SE, even if i lock it, when i start to take the photo,it is changing! I use a lot the panorama function,so it is annoying for me.
Anybody else had the same experience??? If yes,have you found a solution to the problem?

Thank you.