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23.4.2-1

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Same here in the UK at 23:15 last night.

23.4 release notes:
  • Support for IEEE1547-2018 Grid Codes
  • Improved dispatch tools for aggregation programs
  • Alerts for installation errors for Backup Switch
  • Improved performance in cold weather for Powerwall systems
System behaving normally so far.
 
(Where can I see when it updated?)

I’m starting to wonder if the recent behavior change (basically, not using battery ever) is related. Post here.
After logging into your gateway you can use this REST APi to see the firmware version and the last restart which should be when the firmware was applied

Replace the IP address with your gateway IP address.