First losing month ever. Time to start leak searching

[Apanage]

I´m experiencing my first losing month since I started playing poker in august 2005. I´m down 2K with one day more to go.Hell I´m not even showing a profit including rakeback.
I´m having problems this year. Last year I was almost 2BB/100 from 3/6 and upwards but this year I´m down to 0.65.
I have no clue of what I´m doing wrong except for some tilting that I never used to have a problem with.
I have always had a low WSD and a high W$SD but this losing month is troubling me. I have a WSD of 32.5% and a W$SD of 59.5%. WSF 38.96%. Still 2K down which is app.280BB 5/10 and 3/6.How is this possible?
A quick leak search found that I have an extremely high fold to river bet of 49%.

Most folds I do on river are like the hand below:
No reads on villain only stats: 40/20/1.5 over 100 hands WSD 36% W$SD 52%

Is this a call or fold?
What numbers are appropriate when it comes to folding to a river bet if you´re a standard TAG like me (26/19/2.5).


Poker Room skin
Limit Holdem Ring game
Limit: $5/$10
5 players
Converter

Pre-flop: (5 players) Hero is SB with A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img]
UTG folds, CO calls, Button folds, <font color="#cc0000">Hero raises</font>, BB calls, CO calls.

Flop: 3[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] (4.5SB, 3 players)
<font color="#cc0000">Hero bets</font>, BB folds, CO calls.

Turn: 8[img]/images/graemlins/spade.gif[/img] (3.25BB, 2 players)
<font color="#cc0000">Hero bets</font>, CO calls.

River: T[img]/images/graemlins/club.gif[/img] (5.25BB, 2 players)
Hero checks, <font color="#cc0000">CO bets</font>, Hero folds.
Uncalled bets: 1BB returned to CO.

Results:
Final pot: 5.25BB