Meanwhile, Block Island had detached Bronstein to search for a second suspected U-boat; and, while the destroyer escort hunted the new enemy, one of her star shells revealed U-709 on the surface preparing to attack Thomas and Bostwick.

As the second U-boat stealthily maneuvered to attack Block Island, Bronstein made sonar contact on her and immediately began dropping depth charges.

A German submarine attacked and disabled two merchantmen on 14 May, and Bronstein remained at the scene until relieved by ships of Destroyer Division (DesDiv) 19.

Bronstein sailed for Casco Bay, Maine, on 10 June for refresher training and then proceeded to Norfolk to join a hunter-killer group formed around Card (CVE-11).

In the early evening, Card suffered an engine casualty and, for six hours thereafter, lay dead in the water, making it impossible for the carrier to recover the airplane.

The entire hunter-killer group continued to a point northeast of the Azores by 17 August without contacting any submarines; and, by the end of the month, the escorts were in the New York Navy Yard for repairs.

Following the yard work, Bronstein underwent refresher training in Casco Bay and then sailed for Norfolk to rejoin Card.

The hunter-killer group then conducted an unsuccessful search north of the Azores for a reported submarine; and, after making a refueling stop at Casablanca on 25 and 26 October, TG 22.2 returned to New York.

On the last day of February, the destroyer escorts put to sea again to follow several submarines reportedly heading west toward the Flemish Cap.

Bronstein arrived in New York on 17 March for five days of voyage repairs and then, with Baker, reported to New London, Connecticut, to serve as an escort and target ship for submarine training.

Bronstein returned to patrol duty on 14 April when all ships of her division received orders to search for a submarine off the entrance to Chesapeake Bay.

She interrupted this duty once, in July, to embark civilians for an "industrial incentive cruise" followed by a technical availability in the Brooklyn Navy Yard.

Bronstein departed New York on 3 November and proceeded to Green Cove Springs, Florida, where she was decommissioned on 17 June 1946 and berthed with the St. Johns River Group.