Latest tests
After 10 hr shutdown booted into full system perfectly, which seems to verify that the problem is isolated to the sandbox partition.
Direct restart from full to sandbox - induced long BT linking; followed by restart from sandbox to sandbox - long BT linking. From previous observations these results were a surprise. I would have expected both, or definitely the second, to get through cleanly.
Regarding 'spin up' I have wondered if there is a link to the time taken to get to the Login screen - this does seem to be slightly shorter for sandbox mostly.
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