Getting this with a Titan V:

#  zm 0.5.6
#  GPU0 + TITAN V                  MB: 12288 PCI: 1:0

#  GPU0  connected to: eu1-zcash.flypool.org:3333
#  GPU0  server set difficulty to: 0004189374bc6a7ef9db22d0...
gpu_id 0 0 0 invalid argument
gpu 0 unresponsive - check overclocking
cudaMemcpy 1 failed
#  recv failed: 10038
#  reconnecting