I could imagine that your problems are related to the gapps or other annoying apps. The latest version of Vanilla- LOS 19.1 works perfectly fine.
Thanks @Ivan_Meler !
Best solution. Flash modded version from one of the XDA staff member.
https://forum.xda-developers.com/t/app-all-root-solutions-6-0-viper4android-fx-2-7.3774651/page-274#post-86213263