CISCO 4642HD problem

[fbures]

I understand this is not strictly SageTV related, but I am wondering if anyone has come across anything like this:

I have two CISCO 4642HD digital cable receivers connected to Rogers Cable network and controlled via USB-UIRTs.
Since couple of weeks ago (and I believe after an "update" of the boxes' internal software by Rogers) both boxes started to exhibit annoying behaviour:

After some time being on, they both go into deep space. What I mean by that is that while from the outside both boxes are on and look normal, they in fact do not accept any commands including pressing the power off button and do not generate any output. One actually has to press the button twice to turn the box off (to make the on indicator extinguish). This happens in unpredictable intervals and in the vast majority of cases it affects both boxes at the same time. If I do not turn both boxes on and off frequently enough, I end up with a blank recording. That basically defeats the purpose of having a PVR in the first place.

Have anyone ever heard of such problem?

Thanks
Frank