I have had Uverse for over 2 years in Alabama. I had the IPN4320 DVR. I just moved to Tennessee and they replaced all my equipment. I got 2 wireless receivers and the black Cisco ISB7500. I was reading online about all the glitches in this dvr. Most of the posts are back from 20011 and 2012. The only thing I see problematic is that on all my receivers when I scroll through he guide is the screen will go black for just a sec. Since this is happening on all receivers is it a dvr issue affecting the network or just a Uverse system issue? Also other than the added recording space with the 7500 are there any other features I am getting that I wasn't with the 4320? Thanks!