Stop Loss- When to quit a Session

[greg73]

I am wondering if I should employee a stop/loss method to decide when to quit a session of 10/20 Limit. EX: If I am ahead 10 BB and I lose 5 BB on the next hand should I quit to maintain my profit. Most of the articles I read say not to do this but, it seems to never fail that I get ahead and then get 2-3 big hands cracked and end up losing.

Thanks,

Greg