I have the same problem, it seems like I reach my "limit" at a particular table, then I end up losing some (or all of it) back. Here are some of the things that I noticed about my game:

-Tricky play will only get you so far. Usually you can use some tricky play to win a few big pots, but others at the table will catch on and your tricks are worthless.

-Not switching gears enough. Once you've pulled those tricks, it's time to go back to playing a straight forward game again. When the table gets tight, loosen up, when it's loose, tighten up.

-Overconfidence. I'm the big stack at the table now, all should bow before me...

-Playing too loose. .25 cent blind is nothing compared to by $70 stack, lets see some flops. This also applies to calling other people's bets, that $3 river bet is not very much compared to my stack, let's see what he has.

Personally I still haven't plugged my leaks, and this is still a problem for me. So I'm continuing to table-hop until I figure out what my problems are. However I will still stay at a table if: 1-There is a maniac there, 2-A lot of loose players (limpers and calling stations), 3-I have the fear/respect of the other players.