kodi freezes

[griv]

Software
XBian version: xbian 1.0 (knockout) (kernal: linux 3.18.8+)
XBMC/Kodi version: 14.2
Overclock settings: none

Hardware
Device type and model: Raspberry Pi 2
Power supply rating: 1000
SD card size and make/type: SanDisk Ultra microSDHC 8GB class 10 SDSDQUAN-008G-G4A
Network (Ethernet or wireless): wireless
Connected devices: TV & USB 3.0 drive

Log files
Link to logfile(s):
https://pastebin.com/PA5HFgLk

Problem description:
Kodi seems to freeze after a few hours, and my untrained eye can't see anything in the log files. When Kodi is on the screen it makes the correct sound for button presses but the screen itself stays frozen on the dimmed screensaver. I've removed all of the add ons and cleared up as many errors as I could in the log file, but the only way I can fix the problem is by stopping and starting the xbmc service with upstart.

How to reproduce:
Leave running for a few hours

Thanks for any help!