Frigidaire, huh? Never heard anybody complain about Frigidaires suds-locking...
More like Kenmore, Whirlpool, and (Filter-Flo) GE. Let me try to explain: Suds-lock is a phenomenon where, if too much detergent is added, thick, heavy suds that won't drain off accumulate in the outer tub, slowing down the spin and making a big soapy mess inside the washer. Fabric softener or a long, strong spray rinse usually makes this disappear. I've noticed it usually happens with machines that spin-drain, but BD WP/KM machines did this as well on a few occasions, and they drained neutrally. I've also had this happen with my DD Kenmore.
--Austin