I got my B2 about 3 weeks ago and I’ve had the same issue, maybe 40% of the time although it hasn’t bothered me much.I’ll give the SD card thing a go some time then.
More of a nuisance for me is the lack of hot-swapping usb devices which seems a bit fundamental in 2021.
I’ve now reached the end of my CD collection and have been connecting a USB drive occasionally from my Mac, as well as swapping CD drives for the occasional CD which wouldn’t read, so this rebooting is something I could do without.
Enjoying listening to my stuff again though, as my missus had buried some of my music away.