Ramps 1.4 - Marlin - X & Y start jittering during print

I'm just setting up this new printer. I have a Ramps 1.4 board with Marlin. The Y and X axis seem to be running fine when I move them through Pronterface. or with a simple G Code file, moving X and Y in a 100mm square at faster and faster rates.

When I start a print it starts our ok but not too far into the first layer, the X and Y axis just start to jitter. It starts moving with small quick movements then just stops. I have to power off the board and disconnect Pronterface. Then when I power everything back on, it works again.

I've tried making my acceleration higher and lower, adjusting power to motors, changing baud rate on firmware.
I tried writing G code by hand to speed up the movements. That worked fine.

I've tried speeding up the print speed.

Here are some of my Marlin settings.
#define DEFAULT_MAX_FEEDRATE {500,500, 5, 45} // (mm/sec)
#define DEFAULT_MAX_ACCELERATION {300,300,20,400}

#define DEFAULT_ACCELERATION 200 // X, Y, Z and E max acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION 100 // X, Y, Z and E max acceleration in mm/s^2 for r retracts

#define DEFAULT_XYJERK 10.0 // (mm/sec)
#define DEFAULT_ZJERK 0.4 // (mm/sec)
#define DEFAULT_EJERK 5.0 // (mm/sec)

I attached a video of what the head is doing.

Any one have any Ideas?

Sorry i cant watch the movie here but is there a possibility that the stepper drivers overheat?
When that happens they shut down really short to cool and then restart and continue.
This might cause jittering.

your gcode is not being sent fast enough, or is having errors. this may indicate mismatched baud rates, or a baud rate your system may not support properly. try reducing baud rate to 57600. see if your system can keep up, and if the errors reduce.

I was wrong, this is not overheating stepper.

Looks like I have this resolved. Thanks to everyone who responded to my question.

I kind of feel foolish. I had tried adjusting the pots wheel to adjust the power to the motors even before I posted the question. Since some people responded with stepper/power issues, I took another look. Once I used a magnifying glass to look at the wheel, I noticed it was different than on my other boards. This one has stops for min and max, my other ones just have a dial. Once I did get it adjusted correctly, it started working for me.