My Suburban does the same thing, I continually relite it, thankfully it lights easy. I have to hover and look through the window to make sure the burner is still lite. I am assuming we may have the same issue.
Dont want to butt into the OP's thread, but since we may have similar issues I would like to comment. I would like to try the temp at 350, I usually set ours at 300 because it burns things if set too high, but will give it a try this week and see what happens.