[PROBLEM] black scree kodi 14.2~RC1-1427585240

[Fabio72]

Software
XBian version: XBian 1.0 (knockout)
XBMC/Kodi version: 14.2~RC1-1427585240
Overclock settings: Medium

Hardware
Device type and model (e.g. Raspberry Pi Model A/B 256/512 MB, CuBox-i i4Pro, ...): Raspi B+
Power supply rating: 2A
SD card size and make/type: Samsung EVO 8G (NFS root)
Network (Ethernet or wireless): Wired
Connected devices (TV, USB, network storage, ...): TV Panasonic Viera

After updating kodi
Preparativi per sostituire xbian-package-xbmc v.14.2~RC1-1426224368 (utilizzando .../xbian-package-xbmc_14.2~RC1-1427585240_armhf.deb)...

I get the following behaviour:

after some hour screen is black and does not resume with CEC or yatse
xbian is up and network is ok
kodi.bin is running
restarting kodi does not bring the screen up but I need to reboot.
It happened during the last two nights

I reverted previuous version and now seems ok

No errors seen in logs, but I didn't have debug on