I am happy with the results no matter how they got there. The F35 is not completely invisible, but you cannot lock onto it or track it based on what I have read. Iran is one of the densest anti-air zones in the world and given that the Mullah’s tend to punish failure severely I would think that most of the revolutionary guards anti-aircraft corps has an itchy finger. There have been no reports of missile volleys from Iran so unless the F35 is far more capable against the Russian radars than even fans think I am going to go with sabotage.
P.S. - commercial air travel should continue to avoid Iranian airspace.
I like the cyber manipulation explanation for at least one or two of these.