cnc crashes when cutting 2D profiles in wood

[chrisobrien07]

Hi, this is my first post here so thanks in advance for your help

My set up details are follows
CNC machine: Ooznest Workbee. screw driven.
Makita router for a spindle (1/4 inch collet)

Bit : Melin Tool Carbide Square Nose End Mill,
2 Flutes,
75mm Overall Length,
6mm Cutting Diameter,
6mm Shank Diameter

stock : maple or sapele 690mm(7) Long 119mm(X) wide 25mm high(Z)

I am having trouble when cutting 2d profiles through the 25mm
The operation I am trying to carry out is a 2D profile cut through 25mm of stock.
when the bit gets to be about half way through (12mm out of 25) the vibration levels increase.
This then catches the workpiece pulling it out of its clamps and the rest is history....

I increased the clamping around the workbed but the same happened again....
I have attached a few images of the setup of the toolpath for reference
if anyone can help me solve this I would really appreciate it.
I will try send image of clamping set up and the machine

Thanks
Chris