I bought one of these a few weeks ago: https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=255266 I thought it was the bee's knees but then after a couple weeks of light use, the flow valve no longer works. I replaced the orifice with a new one but it still has the same problem. What happens is that the gas will flow for about 30 seconds and then stop and then of course, the thing goes out. Anyone else use one of these and have better luck? I'm trying to decide whether to get a replacement or just send it back for a refund.