Basically, if you're not slaughtering 25NL, you have leaks. You should focus on finding them and fixing them. Focus on all the hands where you lose a good chunk of money, and ask yourself why it happened. Also, post those hands here and let us rip your game to shreds.

Common leaks...

-Holding onto overpairs that are beat
-Not speculating with good pot odds (playing hands like 68s in good spots)
-Not raising reraising enough and/or folding too easily when ahead
-Chasing straights and flushes without implied odds
-Not chasing straights and flushes with implied odds

I could go on and on, but it's your job to identify these things. To answer your question, I don't know what's up with your game. I haven't seen it.