Funnily enough, my lava lite quite very reliably after a couple hours. It will run normally for a while, and then it will just have a big blob in the bottom.

Funnily enough, my lava lite quite very reliably after a couple hours. It will run normally for a while, and then it will just have a big blob in the bottom. I suspect that there somehow is not enough heat being dissipated at the top. I had toyed with the idea of 3D printing a heat sink, but my design would have cost about $100 USD. I actually have a USB temperature probe, it would be simple enough to just plot the temp over time and see what's going on.