S7 edge root - deinstalling apps > Bootloop

Hello,

unfortunately I didn't find any answers to my question.

So, I rooted my S7 edge (Exynos Edit.) successfully.

Everything worked find. I can install root apps, run them, I have guaranted full access to the phone.


BUT,...

the only thin I cannot do is:

Deinstalling preinstalled Apps.
I don't touch system apps.
What I want to deinstall are apps like: Facebook (preinstalled) or instagram. Or google fotos.

When I deinstall them (with titanium backup for example) I get a bootloop.

This is my first phone, where I have this problem.

TWRP etc. working fine.

Thanks in advance!