z motors going forward then reverse randomly

ok
sanguinololu 1.3
stepsticks

I hooked up my board and have printed close to 90 hours without changing configuration.
I took my bot somewhere over the weekend and now has this problem.

I get my bot back and hooked up
One motor will be moving one way then change direction

I tried hitting all the pins with my solder iron thinking it might be connection
multimeter says both motors are hooked as expected
Swapped stepsticks
swapped weird motor for x axis and the motor worked as expected''
reflashed firmware

anyone have any suggestions?
thanks
bryan

Edited 1 time(s). Last edit at 12/21/2013 03:00AM by beverageexpert.

re solder your direction pins on the 644p/1284p also, Z direction pin is pin 3

And re seat the 644p/1284p (ie remove it from the socket and put it back in)

thanks
I just figured it out
it was my molex connector.
I swapped it and now it works as normal.