What's this? Never seen it before on any miner, ever.
2018-03-12 08:35:06|# GPU0 rejected share: [21,"Cannot find job"]
4 times in a couple of hours, using 0.6 on a single 1070.
The pool wasn't able to find the job for the submitted solution.
This could be a bug on pool side.
If this happens more often - pls report the pool you're on - I'll take a look at it.