confidence

[slicer65]

Over the past 5 months I have played 18k hands on .10/.20 with 1.9bb/100 win rate. In this last week or so within a couple thousand hands I have lost 100bb and cant not climb out. Win rate is now just above 1bb/100. I have a couple of winning sessions and then lose it all back in a losing session. Starting to question my strategies are sound.

Two questions. Is 18k hands a flash in the pan or is that a large enough sample with 1.9bbb/100 to show consistent play? If this slump continues, how long before I start thinking something is wrong with my play?