Maybe too much work at once for the gpu.
You could try to change some of these parameters,
I would start to try -w 256
-w from 32 to 32000 default 2048
-a from 1,000,000 to 100,000,000 default 30,000,000
-z from 2 to 30 default 10
I having the exact same 0pps problem. I have tried changing -w and if I set it to anything <2048 the miner crashes
The same to me. But I'll try other parameters.