Hi FredI might have found the solution for my Prob (may be it helps the other TV - Card / Sound card users).
I set the (windows 7) energy - option :
PCI express -> "Verbindungszustandsverwaltung" (in german) -> OFF
Befor i had (one of my energy schemes) set it different (might have been "medium or maximum")
May be the card or its driver (or any chips communication between) was not able to reactivate the card to "active mode".
It might be work for a "laboratory" to examine !!??
There are a lot user out, reporting such Probs.
Oh: By the way: Is there a tool out which can wake up (for sure) PCI connected devices?