Weak DVBS2 signal crashes tv-server (1 Viewer)

[kalon]

TV-Server Version:
MediaPortal Version: Latest weekly
MediaPortal Skin:
Windows Version: Vista SP1
CPU Type: Intel DC
HDD: 2xFujitsu Silent 300GB
Memory: 3gb DDR2
Motherboard: Asus
Video Card: Nvidia 8500GT
Video Card Driver: Latest Nvidia
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card: FloppyDTV
1. TV Card Type: DVB-T
1. TV Card Driver: Latest
2. TV Card: FireDTV
2. TV Card Type: DVB-S2
2. TV Card Driver: Latest
MPEG2 Video Codec: Powerdvd 7.3
MPEG2 Audio Codec: Microsoft
h.264 Video Codec: Powerdvd 7.3
Satelite/CableTV Provider: Canal Digital
HTPC Case: 3 clients
Cooling:
Power Supply:
Remote: MS
TV: 46"TFT
TV - HTPC Connection: DVI

Tv-server crashes and errors:

2008-08-11 22:20:53.618607 [RTSP Streaming thread]: Exception ystem.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at TvLibrary.Streaming.RtspStreaming.StreamRun()
at TvLibrary.Streaming.RtspStreaming.workerThread()
Exception :Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
site :Void StreamRun()
source :TVLibrary
stacktrace: at TvLibrary.Streaming.RtspStreaming.StreamRun()
at TvLibrary.Streaming.RtspStreaming.workerThread()

when signal for example gets weak because of rain. (DVBS) Anyone else with same problem and/or knows a solution or can point me at right direction..?