Random Homing Moves (no replies)

Any idea why my Ramps 1.4 Prusa I3 would randomly, during a print, move to the home position on X, Y, or E when it is not in the G code. Last night, I was about 45 minutes into a print and the printer moved the X axis to the home positon and back to printing. Later, I witnessed it retracting filament to the point I thought it was going to unload. I have seen this behavior multiple times and have verified it is not in the code.

I do have a fan running on the board and have witnessed the impact of heat on the drivers. I don't believe it is a heat issue.