I've done some speculating, but rather than something nepharious going on, it seems just as likely a precautionary measure. An analogy might be discovering you have a roof leak but you are unable to find the specific leak point so you tarp that roof panel temporarily to prevent damage while you investigate the specific location. Once you find the small hole, you patch it and then take the tarp off. We don't know: Tesla may remove (or reduce) the capping after, by their words, finding the "root cause". While I like putting facts together to figure out what they are doing, I personally draw the line at speculating at their end game or their intentions.
Mike
Mike