Stock investors beware: There can be too much of a good thing

More In Santoli on Stocks

CNBC ProInvestors may find themselves in the first bona fide 'stock picker's market' in quite a while
CNBC ProSantoli: This latest reflex bounce for the market stokes hope, but preserves doubt for investors
CNBC ProSantoli: Stocks fluctuate near key thresholds as the market hints at a change in character