Our oven has developed a flame that has a distinct pulse. It is a DCS RGS305. The flame is blue and looks like it always has. This oven has been in service for about 7 years. The pulsing doesn't always occur and it is a really fast pulse. I don't know much about these things. I just want to be educated before i call the service company. I've read it can be the ignitors that are causing the gas valve to open and close. It seems to ignite ok, but can take a bit of time.... Any clues?