I wouldn’t expect that to be normal, if the device were turned off. If it were left on, yes, I’d expect that. 
 

You may want to call Sonos Support directly to discuss it.

Having trouble pairing my Sino Roam with my Bluetooth device. I am on vacation without access to home access to access.  Any workarounds?

None. If you can connect it to someone else’s WiFi, you can set it up, then reset it when you get home, but Bluetooth won’t function until the speaker is set up on WiFi.

A small travel router, or another phone’s hot spot would also work.