Podcasts stopping after a while

Hi, i'm using a naim uniti with the last 4.1 firmware. 

When I select a podcast ( iradio - podcasts by location - europe ...) i can listen to it for a while and often after  about  half an hour it stops. I can just press play  and hear it from the beginning. My internet connection works well, if i listen the same podcast from my notebook it goes well till the end and if I use the uniti to listen to a web radio ( or tmy upnp server) it works well. Does somebody has the same issue? Any idea about it?

thanks

mb