Definitely sounds like water ingress. Could be sunroof drains. They are always a good place to start if you're looking. Even if they aren't the issue, they commonly get blocked and can cause all sorts of weird problems.
The water may be causing a module to short circuit, which may explain the random starting issues.
Has the vehicle been 'plugged in' to any diagnostic equipment?
Sean
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Current: MY2019.5 Ford Ranger Wildtrak 2.0 BiTurbo
A8/S8 - A gap to fill.
Multi-Franchise Main Dealer during the day, Amateur vehicle enthusiast by night.
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