Rern is working hard to iron out the bugs, very active on github.
So we'll probably just have to be patient. He's doing this for free....
As said, the update branch solved my nas logon issue for me.
I do admit I keep a spare sd card with the 'old' (sorry @ janui) version just to swap in when it really goes haywire. Though no Rern ui available any more there.
D