Using 1.28a. Epoch 414 came up, and stale shares were flying. Restarting Lolminer did not help.

Rolled back to 1.26 and everything back to normal.

Which is great, but now I miss the auto-restart option of 1.28. Hope OP can look into it?

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Edit: idd, ethermine was to blame. Just a coincidence that the minute I roll-back, ethermine came back up