On my fledgling layout I have 3 O-36 remote switches (turnouts). Two of them work perfectly, but the third one acts up when any car passes through it from the frog end. The strange behavior includes "chattering" in the switch when a truck passes over the non-derailing section, and the light on the controller only lights up when the switch is "chattering" - as soon as all the cars are past the switch it stops "chattering" and the light on the controller goes out.
If I use the controller or the Cab-2 to throw the switch, the light on the controller comes on and stays on until a car passes through it again. The switch is powered from track voltage - 18VAC since I use legacy - and throws/closes properly from either the controller or the Cab-2; even the non-derailing works properly if the switch is thrown against the train entering from the frog end, but then it starts "chattering" again.
This turnout is the only one of the three exhibiting this behavior - the other two act just like one would expect.
I looked at the other threads about remote switch problems, but the problems they have are not the same as mine. Any help is appreciated.