Hi I have connected 3 easydriver v4.4's to Arduino Duemilanove ATMEGA328running grbl 0.8c and grbl controller 3.5.1 all 3 steppers ran great then one started to only run one way (direction setting pin was changing state) then a second one started to do the same I switched them off and after an hour reconnected them and the same happened but after resetting after only a few seconds they started to run great again. I had set the current pot on each and when running wrong I adjusted the pots again but made no difference. Any idea's please. Ok they are running great now but am puzzled as to why it happened. Cheers Bill
If you can't reproduce the problem it will be almost impossible to find the cause.
Perhaps the motors were overloading the driver boards and causing them to shut down.