Hello! I have been having issues with my kiln not reaching Cone 6 recently and have assumed my elements were getting old. It had been reaching Cone 4 and 5 okay so far. I just started a new firing today and noticed there is an occasional buzzing sound between some of the clicks. I tried to search online and it looks like this could be a sign of a failing/failed relay or infinite power switch? Does anyone have any advice for me on this? I have had the kiln for about 1.5 yrs and haven't had t