There is much discussion on this subject, as you have mentioned. I have had my Pro-HD since Sep 10 and quite often have experienced the problem of intermittent video freezing with normal audio. I have done all the recommendations: reboot, redo the setup, roll back the firmware (which fixes the freezing but then has a lot of video skipping), etc., etc. My host called tech support and they offered the standard party line suggestions that don't work or that we've already done.
In the past couple of months, my SB settled out and was performing very well. However, since last week the performance has gone down the tubes. When I try to view it (remotely at my home in Japan), it starts out like it is going to work okay, then the streaming slows way down, sometimes to zero, and it drops connection frequently. It used to get up to 2000Kbps or so, but I have not seen those high streaming rates in awhile. My host has continued to reboot it, which normally fixed the problems before, but it has not worked this time.
I have ordered a new power supply (on my own dime) because that is another suggestion for a fix. I have read there is a heat problem and some people have even found bad or bulging capacitors (requires opening the box up) in both the Pro-HD and the Solo. My coworker's Slingbox "burned up" at his host location (which Sling replaced). I am starting to suspect this is my problem and I want a new box.
Sling, why have you not addressed this issue?
Since you are having difficulties with the streaming of the Slingbox, the issue might be caused by the connections that you are using or the settings of the Slingbox or your network.
We strongly recommend you to check if the network meets the requirements for the Slingbox PRO-HD and if the issue persists, you might want to contact our technical support department, therefore we can perform additional troubleshooting steps and process a replacement of the unit if necessary.
I hope that helps!