I just discovered what seems to be going on with my guide.  Every few days when searching for channels or info it would lock up and ater a few minutes restart the box and have to reload the guide.  It appears that my guide loads up and uses all the guide memory.  Soon as I look for something that's beyond what's stored it crashes, dumps memory and starts over.  Somehow it isn't dumping old guide data to make room for the new in a orderly fashion.  Still asks for G1 after the crash to reload, but it hasn't been to see G1 since January!
 
Is anyone else seeing this happen or is it another quirk of this buggy old 920 I'm using?