Problem with sharing tuner

[all4dom]

Hi Guys, not sure if you can help me. I have an infiniti pci card installed in my HTPC. I share onlt one tuner to my desktop, ehioch is next to my pc. I am having a problem where my desktop with only one tuner will not stay on. I set it up and it works, but I do not get a few HD channels. Then a little while later I get no picture on any channel and I resetup the tuner sharring and everything would work. So yesterday I setup my desktop to "away settings" and everything worked for awhile. This evening I had the same problem with no picture so I restarted my PC and everything worked. Both PC's are semi high end and my HTPC was just built back in december. My router is a linksys and I am running a gigabit network and like I said both unites are right next to each oter. I have windows firewall and ms anti virus setup and also I am running the newest drivers from ceton. I have submitted a help ticker and am awaiting a response. ANy help from here is appreciated.
Thanks
Dom

[foxwood]

Win7 or Win8?

[all4dom]

Win 7.

[all4dom]

I am not sure if this would matter, but when i use the diagnostic tools on the htpc where the card is located, everything is good, but when i run the diagnostic tool on the pc where the tuner is shared, i get a question mark for cable card verification in the diagnostic tools.

[all4dom]

So no response on this board & no email response since sunday..either a bug in your system & u can't fix it or a flaw with sdv?