Radionomy told me that the problem is linked with the broadcast software
Why do they think so? Have you tried other broadcasting software?
That is a typical answer from those guys. I can say the same: No other customer is having any streaming issue: So it must be Radionomy!
How often are you disconnected?
What type of server is Radionomy running: SHOUTcastv1, SHOUTcastv2, ICEcast 1.x, ICEcast 2.x...?
What is your encoding profile (MP3-128kbps, ...)?
What soundcard are you using, what OS and what type of PC are you running?
Are you broadcasting from ProppFrexx to another streaming servers in parallel?
If yes, do you have problems with them? If yes, what happens, if you only stream to Radionomy?
Have you tried another streaming software, e.g. a stand-alone streaming only solution?
It still could be your internet connection. What upload speed does your internet connection have?
Do you maybe have a limited internet connection, e.g. with a monthly or daily maximum volume traffic (e.g. after X GB of traffic your speed is limited)?
...
AS said, I do not believe that it is a ProppFrexx issue, as no other user is having a streaming issue.
So far ALL reported issues have been network related...