Millenium Bypass, not so fast

I built this last week, see the previous post. Everything seemed fine on the bench. Today I gave it a test with the band. Seems like it is not working quite right. The LED lights when the effect is on. But, when the effect is off the light slowly turns on over a few minutes. Turning the effect on and off again resets the light. Not sure what is going, need to read the documentation over at GEOFX a few more times…