Mondeo electrical gremlins

[LX355]

Hello to all members. I'm new to this site and this is my first post so please forgive me if this is in the wrong section.
I purchased a 2011 MC Mondeo for my daughter's first car about 12 months ago. All's good with the car except during and or after an electrical storm for some reason the right side park/tail lights will come on whilst the car is parked [regardless of being locked or not] and at times the right blinker will activate when starting the engine. I'm a retired mechanic but this has me stumped so wondering if anyone can help please.
regards Mal