auto retune problems with digihome 80?

for the last few weeks my dighome 80 has had its memory wiped every fri.night,this results in my edited channel list being wiped ,and replaced with a new full list, but more importantly my future recordings list is replace by old repeat instructions which i have deleted several times, who is to blame for this intrusion and is there any chance it can be altered or is it another case of : "tough luck if it messes you up, as long as long as it suits us !"