We own two CM-7000 DVRs bought in 2010. One always has and still does work perfectly (well, except for the well known DST problem). The other DVR has started to freeze/hang every so often -- everything on-screen is locked, and the remote control has no effect. As far as I can tell, when this happens, all I can do to regain control is to reboot via the remote control (long push of the power button). At first this freezing seemed to happen during playback, but now I see that it will occur even while just using the tuner. Is this is known problem? Is their a fix?