It's interesting to note that each of his last 2 seasons, his 3pt shooting has tapered off as the season progressed. Don't have time to do actual stats analyses, but if you look at the game logs, he had many more bad games in the latter ~1/3 of the season. It was more pronounced as a Soph and Junior., when he was logging many more minutes.
Lots of things factor into "hot" or "cold" shooting, including general form (too complex, can get out of sorts more than a simple repeatable), injuries, offensive sets, defense, etc.
But it sure seems like the slog of high-minutes might catch up to him. Maybe.
I'd love to see Alex get less minutes this season. It may benefit him as well as the team. We sure are deep enough with experience and talent to support it.