Looks like It is a typical problem!
My story!
Bought new iPhone 6 ( 64 Gbit)
after 3-4 months screen from left started to get "loose"
I had insurance and I dropped my phone so Insurance got me new one.
Second iPhone 6 also had problems with scree starting to get loose after ~6 months ..
And as clumsy I am a dropped the new phone and got another one ...
Now the 3-thrd phone - again the screen is getting more and more loose ...
I had it and went to Apple shop and asked, whatta hekk in going on?
I payed like 900€ for it, and the build quality is garbage ...
Apple store workes showd me that the loose screen is noo "big deal" even hers was getting loose ..
ANd because 2 year warranty is over Get e NEW ONE!
At the end I went to real repair shop that told me about this problem.
What actually happens in most cases is that phone will bend a bit in your pocket and the glue that is used to attach the screen to your phone starts to get loose.
So there is actually 2 major reasons for that:
1) iPhone 6 aluminium case is really weak ant without extra frame to protect it - that makes it to bend.
2) Bending itself is not so big deal in other phones but iPhone 6 glue ( used with display) is really bad and screen will come loose...
So yeah.. Quality and durability is really BAD at least with iPhone 6, not so sure about others.
And Actually Im really amazed that there is no callback or refund campaign from Apple side because this is giving bad taste to all of us...
For ~1000$ and more I expect good software ( soft is actually good but not amazing) and best quality build and durable hardware .. currently the build quality and durability is a BIG disappointment.
My last hope is that SE models are better builds than other.
If not - why shuld I ever buy a new iPhone if it just is not usable on daily bases ....?