Pololu Micro Issue

I made a few posts along time ago under the guest profile under 1Robomaker.
Revewing them may help with my question now.
I seem to be repeating some old problems. Only this time I want to be sure that I do not keep repeat them. After adjusting the baud rate to my micro from 9600 to 19200 my micro just stopped working all together…

any thoughts?

It is the same robot as in my previous posts. It has been working fine for so long. With the exception of the unexplained sputter here and there with the motors.