After months of being frustrated by freezing every few min on my DM800 HD despite trying various image/cam combinations, I have finaly got it sorted, so for anyone else having problems, this worked for me (Hope it works for you).

Image is a modified version of Nabilosat Black Hole v0.5 (changes - secondstage-loader #70, fixed mp3 playing, HD bootlogo 1280x720)

Cam is Evocam downloaded from Nabliostat with the config file modified from auto-update "auto" to auto-update "yes".

No freezing and keys auto-update.