i don't know what Bugs u guys have but i just installed RR Clean (was on crDroid) and everything works just fine, no ui Restart no youtube Problem no background or spotify Problem, all works just fine snappy and smooth.
My way for installing Roms:
If the Rom comes already with Vendor (like PA) i simply FORMAT Data (where u type yes) after that i usually switch /data to f2fs and Reboot to Recovery, then i Install The Rom just normally, after that TWRP Installer and then reboot system
If the Rom doesn't come with Vendor i simply install OOS on BOTH Slots (before Installing dont forget to format Data) and after OOS Is installed i Format Data Again, then Flashing the rom Normally and reboot.
With those Methods i don't have any troubles and RR is the Most easiest Rom to get Installed Properly, if u try Install POSP Right ur ending up getting yourself depressed lol
I Know there are many ways to flash and many ppl telling different things but make sure u ALWAYS FORMAT Data.