Hello, my Viking range has new igniters but one of the burner stops throwing flames around 1 minutes after lighting. Both ignitors glow well but only one burner continues to heat up with flames. The other one has flames fading down after 1 minute or so and then stop heating up while its ignitor still glows. I got a technician who said the issue lies in the safety valve but I am skeptical because the burner works fine for a minute or so which makes me think that the ignitor is losing some power after 1 minute. What do you think?