SB3 connects and then powers off after turning on at wall

Hi - if I turn my SB3 on at the mains it successfully connects to the
WiFi but then powers off, and I have to tell it to power on which it
does immediately. How do I get it to stay on? I have another SB3 which
does stay on and I can't see any differences in the settings. The only
vaguely relevant setting I can see is Player->Audio->Power on Resume
which is set to "Pause at Power off / Resume at power on" and this is
the same for both SB3s. 

FWIW I am running LMS 8.3.0 on a Pi4 which is left on at all times.

Any ideas?



SB3 -> Quad 909 -> Quad Electrostatic speakers, Quad 405 -> TBI
subwoofer
3 x SB3s + SB Radio
LMS on Raspbian on a Pi4
Rotel RSP1068 surround processor, Quad 707 -> B&W surround
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