Antminer S2 using Bitminter (backup Slush's but doesn't say it switched to that).  Has been running nonstop the past week. I started wondering why I didn't have the next payment when I should have by now, so looked at the transaction history on bitminter.com...

Was getting payments each shift multiple per day but suddenly nothing between 8/7 12:29 and 8/10 15:48? How is that possible?! Averaging near 1 TH/s and stable, what could be going on or something I don't know about payments?

I know I have a lot to learn about mining but don't know where to look now. I picture someone routinely changing my miner to work for them instead over some period of time but how to find out..