Makerbot2 shaking

Hello
I have very annoying problem:
When printing small circular edges, the printer shakes violently.
Almost as it tries to print a gear.
This only happens with circles, never with straight lines or other shapes.
Slower print speed reduces this, but not completely.

What slicer did you use?
If it was the Cloud Slicer (or slicer for Makerbots) then could you please try to do the same print using Makerbot’s slicer software? If that works better, could you provide the sliced file?