Are you a T6 or T6.1?
What model are they?
Do you know how they are connected?
Are they directly powered from a circuit, if so which one?
Or do they have a power feed and tap a signal from a circuit, again which one?
Pics help folks lend a hand if you can get some.
First thought is either they are getting a fluctuating voltage on the power side or they are being fooled by some pulsing on the circuit they are sensing from.