Make sure you have googleservicesframework;
if your missing something look into GAPPS installer;
If your using a modified rom, make sure you have a super user app like supersu;
really we need more information, how did you root, what rom build are you on, and what is your carrier?
Mod 3 is my daily user, I run on a s7 EDGE;
Root, XPOSED, LP, Modified GPS. and 4GB Ram.
Android 6, since 7 don't support xposed yet.
also I patched my linker a_a