OMG Wow Wow Wow!
Your reply could not have been better timed and spot on! I was at Panera when it started to happen again, all the while atop my SNUGG case-folio so as to not get it dirty. I could not access my laptop so I opened up my phone and had to check an email, albeit irately until I saw your response in my email. And tadaa, I could not believe it...i started to remember all the times it happened and yes, you are correct! I always had it on my case-folio which has the snap-magnets! I remember other attempts trying to recreate the same issue but could never do it when laying my bed with the case-folio away, etc, on my desk, etc. I only use the case-folio when I am out and about and that is only when it happened. I suspected sunlight but I think the magnetic interference is very possible...and I truly now know how important magnetic interference and electromagnetic interference can be since I do a lot of work with drones and the slightest interference from magnets can screw things up big time.
So I must say, as smart as I thought I was, as much of an academically prepared engineer that I am, as much as I thought I had investigated it, your analysis blows me away because it seems so simple and obvious but at the same time not so simple and obvious. I think you figured it out. I will also try to test this out more but I think you are right!
You deserve a Nobel peace Prize for this! I was literally hours away from wanting to sell this on ebay lol !
Thank you!
--Sam