A comment from the peanut gallery:Looking like that wifi theory was incorrect :-( I removed the wifi account from the car at about 17:45 yesterday, and car stayed online until I drove it (Tesco click and collect!), and then for an hour afterwards before going to sleep. I thought, Ok, it's now settled down and sleeping, so sorted, but then I get up this morning and whilst it slept for 11 hours, it woke up at 07:13 this morning and has been back in ""falling asleep" state for 2hrs 31 mins so far. It still seems very strange that it was not happening at the MIL's, so maybe whatever it is doing is now happening using the onboard SIM as opposed to wifi, What it is/could be doing is another matter entirely!
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2.5 years ago, I had to have the front port-side headlamp replaced, as I was suffering what was then a typical early build headlamp issue.
When the mobile repair chap showed up, I was expecting the typical remove bumper, disconnect headlamp, R&R the headlamp, re-connect the new headlamp, button things up and good to go.
However, once everything was buttoned up, he connected a laptop computer to the car AND had his smart phone going because...
...that headlamp had to then be "installed", like when one gets a new home printer, you have to fuss with settings, drivers, etc to get things to talk to each other.
When asked, I was told that the replacement headlamp would only fit in a small range of VINs and that the car had to recognize this before the new headlamp would function.
Where I'm going with all this: none of the "smart" parts of these cars are interchangeable with all others of the same model year.
And that is why we will all get the same software version, but owner "A" has one new bug, owner "B": gets a different new bug, owner "C" has no issues, etc.
IMO, a bunch of folks in the UK, in some VIN range, must have one "line replaceable unit" (LRU) batch that is not happy with the current software iteration...