Maintaining profits

[JH1]

I seem to be having trouble maintaining my profits at the tables lately. I usually play quite well the first 1/2 hour or so, usually gaining 1/2 to a full buyin. Then I slowly start to lose it back. I try to change my play up a bit, but I'm thinking that other players are finding betting patterns in my play or something [img]/images/graemlins/confused.gif[/img]

I'm curious about what you guys do to keep those profits from dwindling away, ie change tables often, drastically change gears/playing styles, just key on the fish etc.

I've thought of setting stop limits, but I know you guys don't recommend them because the game may still be good. I'm starting to feel like I should get up and leave once I hit 1/2 a buyin, but if there's a better way I'd love to learn about it.