sudden crash in EPG on channel select

[FiskerK]

I am experiencing a couple of system crashes, when browsing the EPG and selecting a channel. the system reboots by it self and returns to a channel. not the one I came from but the same one everytime.

it doesnt happen every day but sometimes, it happens several times a day.
I have attached the crash log.
hope someone can help.
Best regards
Nick

EDIT:Section of crashlog

<211540.964> Traceback (most recent call last):
<211540.964>   File "/usr/lib/enigma2/python/Components/EpgList.py", line 403, in serviceChanged
<211540.977>   File "/usr/lib/enigma2/python/Components/EpgList.py", line 412, in findBestEvent
<211540.977> IndexError: list index out of range
<211540.977> [ePyObject] (CallObject(<bound method EPGList.serviceChanged of <Components.EpgList.EPGList object at 0x8f52edf0>>,()) failed)