Can you post your configuration.
timeout /t 25
set PATH=%PATH%;./dlls
set TERMINFO=.\dlls\terminfo
set GPU_MAX_ALLOC_PERCENT=100
sgminer --algorithm darkcoin-mod -o stratum+tcp://stratum.cryptotrain.net:3332 -u xxxxxxxxxxxxxxxxxxxxx -p x -w 128 -I 19 -g 1 --thread-concurrency 8193 --gpu-reorder --gpu-engine 1150 --gpu-memclock 1500 --gpu-fan 100 --queue 0 --no-submit-stale --scan-time 1 -s 1 -E 1 -Q 0 --lookup-gap 2 --api-listen --api-allow W:127.0.0.1 --gpu-threads 2
It just happened today
I have a feeling your thread-concurrency should be 8192 not 8193.
Try using port 4444 instead?