I never had that happen with any Greenlee bits but they didnt seem to keep an edge for very long. I buy Lenox stainless steel ones now and have zero issues so far.Anybody have issues with the greenlee ones? I was using one at the local staples and dropped the bit from about 2 - 3' while cleaning up and shattered the bit. The tile was not even high quality ceramic tile floor. Bit was not that old, maybe just faulty?