Frazier's BABIP might be attributable to his 18.1% line drive rate. That was worse than Hamilton, Votto, DRob, Miller, Bruce, Ludwick, Paul, Izturis, Hanigan, Choo, Mesoraco, Phillips and Hannahan.
Only Cozart (very slightly), Lutz and Heisey had worse LD rates this past year, excluding pitchers and excluding Soto and Rodriguez (0.00).
I'm sure the Reds professionals have a view on whether Frazier will rebound. He has a long swing and I question it, but it's a judgment for those with hitting expertise on the club.