LittleBill wrote:
sounds like the printer is in adhoc mode
adhoc mode shouldn't cause an interruption (although most anything is possible) however often times portable devices ARE designed to turn off all unneeded power draws like backlights and wireless radio cards in order to "conserve" battery power as DEFAULT.
"surfing" the net is an "activity" but, streaming is not an activity because you are not ACTIVELY using the portable device (IE screen taps, movements or gestures).
Since it is happening regularly at 20 minutes the power save features may be enabled for the radio card, basically turning the card off until you OK it to start again.
To prove this theory, try every 15 minutes some screen "gesture"to "wake up" the device. If I am correct the streaming will continue past the 20 minute mark. If this works then go find the power settings and make the change to not power down the radio card. Just keep in mind in doing this the card will be active ALL the time and may reduce your battery time per charge.
Honestly however since your are connecting this to a stereo or amplified speakers, perhaps think about buying a purpose made "Internet" radio tuner which is designed for playing streaming radio channels.