Weave frequency changing

I've noticed when I'm testing my welds in T1 that the weave will increase frequency after a few cycles. This happens both when the weld is on, and when the weld is off. It's almost as if the weave frequency is ramping up, but I don't have (at least in my program) any weave ramping. Is it possible there is a variable set that is causing this?

I'm stumped by this one because I've never seen it before.

Thanks.

I know it's been a while, but has anyone else seen this before?

Fanuc 120iC/10L, R30iA controller with a Lincoln Powerwave i400

Quote from Boyd

Is the physical number of the weave frequency changing? Or is just looks like it is changing?

It just appears that the weave frequency is changing. It starts slow, and then speeds up.