I just got a 14.5 lava lamp. The first time I plugged it in and used it, it flowed perfectly.
Every time since then, it warms up, then makes the domed glob like in the "too hot" illustration.
I'm using the 25 watt bulb supplied with the lamp. I even tried using a 15 watt, but that wasn't enough to do anything.
What's a solution for it constantly being "too hot' except for turning it off?