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Sorry, I could've been more specific. All speakers cut out at the same time.
The system is Sony model number BDVN790W. And I've looked, but I can't find if the rear speakers are bluetooth or something else.
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Reading the manual, it looks like the surround speakers use a separate surround amplifier that is connected with to the main box with optical cables. Then a wireless connection is made from the surround amp to the surround speakers.
Page 40 shows advanced setup instructions for that. The wireless connection can have problems with interference from other wireless devices in the area. Or there could be a problem with the optical cables (unlikely.)
That doesn't explain why ALL the sound is cutting out, though. Maybe the system has a feature that mutes all the audio when the connection is lost to the surrounds. Or maybe the main box preamp is just malfunctioning.
Hope you get it sorted out.