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DVR (Scientific American 8240HDC) Pixeling and Freezing

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I have been a Cox customer for many, many years.  At present, we have one DVR and two regular boxes in our home.  Over the years, we have had problems with our family room television picture, which used to have just a regular cable box, pixel and freeze, and Cox sent several technicians to try to remedy the situation. It took awhile to get rid of this problem, but it finally went away for quite a long time (years). Eventually, we upgraded to a DVR box, which we had been using for the past several years without any problems.  A couple of months ago,  it starting acting up - wouldn't allow us to record or playback, almost like it lost its memory.  We'd have to unplug it to restore it.  So I finally got tired of dealing with it and took it into the Cox outlet and traded it out for a new DVR box, the same SciAmer as before.  After two weeks, this new DVR box started tiling and freezing a lot, which the old one never did.  I disconnected it and put one of our other non-DVR boxes in its place to see what would happen.  The picture was perfect for over a week using the other box. (The tiling and freezing only happens on the DVR box, not on any other outlets in the house.) I re-attached the DVR box and it pixeled and froze again right away, so I took it back to the Cox outlet for another one.  This new DVR is doing the very same thing.  I have rebooted it, checked all the connections, disconnected it for ten minutes and reconnected it, rebooted it again (where it goes through the whole sequence, takes about 10 minutes) etc. etc. Works fine for about a half an hour and then it is tiling and freezing again..  I can't tell you how annoying it is.  I need someone from Cox to be honest with me.  I've been a customer long enough to know that this issue has gone on for years and years.  Is it the luck of the draw as to which DVR box a customer gets as to whether it will pixel and freeze? Remember, substituting the DVR for a regular cable box gave us a perfect picture for over a week, so my cables are working fine.  Then as soon as the DVR is put back in place, freezing and tiling.  It is ridiculous to keep going back for a new DVR or waiting for a technician to come out, only to tell us "everything seems to be working fine" only to have it start acting up again.  Is there any other DVR box to use besides this Scientific American or are we stuck, in which case, there is no reason to rent a DVR.  The playback shows we record on this DVR won't play if the box started freezing while it was recording, which makes the box useless.  I've wasted too much time on this, I just want a box that works as advertised and paid for. 


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