Hello When my boiler kicks in, the lit burners on the hob all go down slightly until the boiler stops, and then return to normal. Just like the burner control knob is turned down slightly. Is this anything to be concerned at? For a bit of info, the boiler is next to the incoming gas main, and the hob is on the other side of the property on an approx 15m 15mm copper pipe run, T'd off from the boiler supply. Thanks DM.