Same problem here with TT C-1500 (cam+ci also).
I am getting no audio/video error very often and also picture stutters all the time.
I have tried everything to get off stuttering but nothing works.
I think best solution is to change new card...
Uups sorry...
My problems is in "Normal" MediaPortal not TV-Server...
Anyway this TV-Server didn't work me either...
I got picture when i tried it but ... I could not change channels without errors etc so i give it up.
I think that there is some problems with technotrend BDA drivers...
My tt c-1500 works fine with WDM drivers but if i use BDA drivers picture stutters. No matter what fronend i use. ( I have tried MediaPortal, TT own software, DVBViewer, Gbpvr, Meedio etc). None of those don't work...
Also i have changed my graphic card and motherboard + processor.
I think i will buy digibox with recording included...