I've been experiencing some problems with Jarvis.
On several occasions during boot up the Slice has frozen, usually while it's on the boot screen with "Slice (community) Version:........ in the top left of the screen, only way out is to pull the power.
In the add-on repository menu, I have OpenELEC Add-ons(unofficial), which works fine in 15.2, but says it's unavalable on 16.0b.
Because of these and my ongoing problems with TVHeadend, I tried to go back to Stable, using Noobs (recovery), this got me in a boot loop, where it would show the Kodi 15.2 start screen, just get to the menu screen, then go back to the Kodi start screen etc.... again I had to pull the power.
The only way I have found out of this is to use recovery to go back to 16.0b then restore my setting from 15.2, then while it reboots, use recovery again to install 15.2. This got me back to a working stable 15.2, with a fully working TVHead end
As a side note, during boot up of 15.2 and previous, there was a splash screen showing SLICE and the logos of Kodi, OpenElec and Pi, this is missing from 16.0b