Sorry for the late reply, and I think technically yes, he's been credited with 3 fumbles. However one of the fumbles came from poor blocking on his blind side and the defender hit Brock while he was throwing the ball. Brock's arm went forward and the pass even went 10 yards, however UNI scooped the ball up and it was called on the field a fumble with a TD. The one against ULM happened because one of the RB's, I think Kene Nwangu, had miscommunication with Brock and tried holding onto the ball too long on a read option play.
All of those things need to get cleaned up and all go down as fumbles and should be a force of emphasis for Brock for the rest of the year.