Yeah, this came up in another thread. His accuracy has seemed spotty this season, seems to have regressed a bit. I'm sure some of his mechanics may be regressing slightly, probably hard to keep them perfect as a season wears on unless you're a vet who's practiced it time and time again (see Blake Bortles as an example of someone who improved mechanics but did not keep it up).
Also, I think he's starting to see a lot of different looks from defenses now, things he hasn't seen before, the newness (Jacksonville supposedly was playing more zone this game than what they usually play) may cause him some hesitation which then screws up his mechanics.
I think some of his low throws could be do to this too.
It's worriesome only that he has to have the will and help to work on it and not let it become habit.
And before the pitchforks come out... this seems perfectly normal for a "rookie" QB. Just want to see him make progression on this piece over time.