Service light and other strange things happen

[Sol]

Maybe worth checking if you have dirty water getting into the bsi module / ECU in the engine bay.

That would cause this weird behaviour.

Conductive fluid on the board or input terminals can trigger events as if you had pushed a button somewhere. Worth investigating before it gets worse. At least you can dry it out with a hair dryer and then seal where it's been getting in with clear silicone.