Fixed the rejects issue - I'm haven't worked out why it happened yet but I'm looking into it.

Edit: Maybe not - seeing it with nicehash, but not with solo. Still looking.

Edit 2: nicehash seems to have stabailized for me - I'll do more testing today and monitor it.

Edit 3: And it's rejecting again. A bit closer to identifying the issue at least.

Edit 4: Made a change to try to fix the rejects that occurred in edit 3. Monitoring.