Hoist suddenly stops, and often will not restart until several attempts later. E68 code is displayed on CCS messages. It means that the KEB hoist drive releases the brake, and looks for the microswitch contact within 600ms (.6 seconds). If it does not, it will fault. Follow the steps below.
Hoist Brake Microswitch Adjustment
Also with this situation, the operator claimed the load would drop slightly. Was able to verify during startup, K405A (validated drive contactor) would close and K409M would energize allowing the brake to release, then the drive would shut down. Could recreate and U400X #29 was supplying +24VDC at startup to energize K409M. This comes directly from the drive, replace hoist frequency drive