Does anyone know why my dm525 combo got stucked on skylink channels on 23.5E like food network, fine living, nat geo hd, nat geo wild hd and travel hd and after about 30 minutes picture stays frozen and the whole receiver is blocked and i can only turn it off on back side. I've tried images like opendreambox, open hdf, open atv, pli5 and nothing helps. What can i do?