Hey there,
I am currently dealing with this same issue, among other electrical problems, on my 2013 SEL with just a smidge over 100,000 km's. Were you ever able to find any sort of concrete answers on this? I've found that so many folks out there and just for the sake of making a youtube video have come up with random ideas. Mind you, some are much more sensible then others, but it's hard to get a grasp on what will actually work.
In addition to the power windows issue, which is now becoming a bit of problem now that the temperature is warming up here in northern Ontario, Canada I'm also dealing with the door ajar issue. This one is quite odd though, because as soon as the fall came with the cool weather last season, I rarely if ever had a door ajar issue. The minute we had a warm stretch, it's not but door ajar issues..
So I'm really just curious as to the direction folks who have recently encountered these electrical issues have gone with it.. I wish I had some advice/pointers to give, but unfortunately, I'm just now looking into the issue.
All the best and cheers!