If you are using a cline it is common if the server is loaded to the maximum clients, it should not freeze on FTA channels unless your dish is being battered by high winds like mine was on friday/saturday
Flashing won't cure it if its a cccam problem
i was having that problem always freezing so wat i done was went into setting display and it was set to 1080p so i changed it to 720i and it doesnt freeze now hope that helps worth a try and if not it could be the server your using