One of six GPUs has 99% Util and 0 H/s, Progress gets stuck at 99%

[KT819GM]

Also it can be too high clocks for gpu/ram or too low ram clock, also PSU problems can behave like that. What I would try is just to lower clocks a bit. Besides on your card's you should get a bit higher MH/s if they are on stock clocks (1000MHz?) so maybe cooling problems occur and they start throttling clocks and this sometimes is the reason for ASIC hang.