lava started to stick to the side of the glass

[Rita Suter]

27 in tall, was bought new, includes original boxes and bulb. Was working great but for unknown reason the pink lava started to stick to the side of the glass. I removed the top and tried to scrap the glass clean, it started working good again but then started to stick once again. Anyone know how to help

[Pascal]

I had this problem too with one of my Mathmos Lunar bottles
I´m not sure but I think your lava was to hot. So your lava stick an the glas. It´s not repairable!!!
Greetings from germany.