Which ROM do U actually use - 7.0 or 7.1.1?
What U should do is clear dalvik ART and cache after kernel flash. SLK models were tested and no issue was reported.
Regarding someone reporting com.android.phone has stopped issue - it happened once or twice someone has that encountered. But doing as above suggested, usually sorted issue.
V3.1 kernel brings fixes for mobile hotspot in Refined Note 8 port 7.1.1 which wasn't an issue in Refined Note 7 FE port (ANDROID 7.0)
---------- Post added at 10:22 PM ---------- Previous post was at 10:14 PM ----------
Actually it would be much better to link this kernel in Anan's Refined Nougat thread - also github source link needs adding.
Specifying supported models in OP also may help for users who are new to Note 4 development