LA 412dc close limit changes on it's own

[shnikabone]

I have an LA 412DC single gate opener that won't stay put. I reset the open close limits and everything will be working perfectly and then a day or week or a couple hours later I'll drive up and the gate is not where I set the close limit to be. There doesn't seem to be any pattern as to how far out of position or which direction it has moved.
Was wondering if this could be caused by wind as there is no latching device on my gate.
Any info would be greatly appreciated.