VU+ solo internal memory full??

Hi, Ive very new to getting around my new VU solo box and am having issues with the internal memory becoming full. Unfortunatley I wasn't using a USB key and now my box crashes regularly when trying to update channels etc. many of the logs say I/O error out of memory and others refer to errno28 no space left on device /etc/fstab.tmp. I've got both vu solo control centre and dreambox control centre installed but being a complete novice am not sure where to begin! As a side note when I mount the USB key I notice after a while the epg goes back to internal memory settings. Hope this is something straightforward or maybe someone can point me to another post where it has been explaines...Thanks

It says Kernel 2.6.18
Image version 2.3, Build GM if that helps..thanks

Hi it says the following:

Kernel: 2.6.18
Image: Release
Version: 2.3
Build: GM

I did try the swapfile and set it to 96MB with autostart. For some reason when I go back to EPG.SETTINGS it goes back to internal memory? Should I flash the box first and try again?