Shia LaBeouf’s Behavior While Shooting New Movie Concerned Some on Set

Shia LaBeouf was arrested in New Orleans this week on two counts of simple battery charges … and TMZ has learned some colleagues were concerned about him while shooting his latest film.

The veteran actor finished filming “The Rooster Prince” just a few months ago … and TMZ is told he showed some troubling signs at times.

Our sources say that, for the most part, LaBeouf was a consummate pro … but they say he also displayed erratic behavior … including intense mood swings. We’re told it was enough that some peeps on set wondered if he might be facing personal troubles — especially given his checkered past.

However, one source noted to us Shia’s character in ‘Rooster Prince’ suffers from mental health issues, and the actor really commits to his roles … so, that might explain his behavior. We also hear Shia’s arrest won’t impact the film’s schedule.

To be clear … no one we talked to claims they saw any behavior like the kind we’ve recently seen — no arrests, no fights — and they’re all heartbroken to see Shia’s recent string of incidents. Our sources say they hope he gets whatever help he needs.

As we reported … Shia was arrested and charged with two counts of simple battery after allegedly starting a fight, then getting beaten up outside a bar this week during Mardi Gras celebrations in New Orleans, where he purchased a $1 million home after he separated from his wife, Mia Goth.