Follow up to my original post. With Summer coming on I have not replaced this bad lava. The larger lamp is at work so I turn it on every day anyway. So this lava is just crazy. Some days it just sits there as a big blob on top of a lava stem for 8 hours. Other days after a normal warm up I get a lamp that could not work more wonderfully. Absolutely beautiful with the shapes and separations of the lava flowing up and then back down. Then the next day Nothing! Every day when you turn it on, you never know what you will get, A beautiful working lamp, or a dud.
Just wondering if anyone else has seen anything like this.