As we have just replaced all our wooden frame windows with uPVC necessitating temporary removal of 18x 20yo Weyrad Viper 3s,thought I'd replace old VIPER 3 shock sensors with new GLX ones retaining the 6-wire connection. Mostly OK except that the GLX LEDs flash for an hour or two then fade. I think the 12V/0V connections are sound. Any clues on what else to check?