Please do the following:

1) Launch /Applications/Utilities/System Profiler.app 
2) Select "Save" and save a system profile in SPX/XML format. 
3) Quit System Profiler

Please do this at two points:

a) when the receiver works as it should. 
b) when the receiver doesn't work as it should

Please send the resulting two files to info@iospirit.com and include a 
reference to this thread. I can then look into the issue in detail.

Thanks in advance.

Best regards, 
Felix Schwarz