on a more or less regular basis the internet radio of our NP-3700/12 is switching off.
This happens although the Field strength of WiFi is more than ok. (4 bars)

After starting up internet radio all is ok till next time.
During the swithing off the radio cannot be controlled by the remote when the distance is more than 2 meters.

We have three radios and all are reacting in the same way.

Anybody experience with this problem?