Castle Mamba XL2 ESC cogging

[othello]

I'm using a newly bought Castle XL2 ESC with the following setup:

- Car: Carson Dirt Attack XXL (Redcat Rampage XBE clone) wheighing 9.3Kg (20lbs 8oz)
- Motor: Turnigy TrackStar 1/5th Sensorless Brushless Motor 730KV (Size: 5592)
- Batteries: 2 4s Zippy Flightmax 8000 30C batteries wired in series for 8s

XL2 settings:
- Firmware 1.32 (Date 4/5/2011 -> is this the most recent one? ... castle link says yes ... i wondered about this since that's more then 2 years ago)
- Startup Power is set to low
- No punch or torque control
- lipo cut off is set to 3.3v

No additional cap bank and i'm using the BEC to power the receiver and servo.

During the first few minutes startup is as smooth as i could wish for, but with time it degrades more and more up to the point where the motor coggs badly and the car almost isn't able to start on it's own. This only happens if the car comes to a sometimes nearly or complete standing still and then if i try to get it going again = cogging.

Two fellow members on our austrian forum (german speaking) have reported the same behaviour and haven't found a solution to this.

Anyone else experiencing the same issue?

Any firmware update planned soon or is there a firmware i can switch back to helping with this issue?

Anything else i can do to ge a constant smooth start up up to the moment the ESC hits LVC?

What i noticed is that when startup works as it should one can hear a dedicated sound from the ESC the first second as the motor starts up from 0 rpm. Can't hear that anymore when cogging at startup begins. As if the startup sequence isn't engaged any more after a few minutes.