lost EPG in standby mode

Hi all need help with blade 7000s, when I put the stb in standby mode I loose all the epg that I have down loaded from all groups, this has only been happening recently,hope someone can help, thanks.

Press OK then yellow button to update.
From BM
If you have a USB stick in the box it will save the data to the USB when you put the box into standby, and reload it when you turn the box back on. (Please note there is a delay of around 20 seconds while saving and loading take place)

thanks mcm, yes thats what I have always done and had no problems before but for some reason it no longer remembers the EPG when I put it in standby mode something must have changed in the software but I don't know what.

you mentioned the USB stick I have just checked to see what space was left on it and and to my surprise it was full so deleted some football that was recorded and low and behold
 EPG has now been remembered thanks again MCM we cracked the problem, cheers buddy.