Hi and welcome. You've heard good advice-- try to clean it and if you can't retire it-- but I do want to add a stuck button is a dangerous condition, in case you don't know. It is possible to get the battery so hot it will vent or even catch on fire, if it doesn't get time to rest and cool down enough between puffs as it gets in normal usage. Still worse, an auto fire is hard to undo. The button is stuck, the battery can't be taken out, and the tank will grow too hot to hold in your hand to unscrew in a short time of continuous firing. You really, really don't want to go anywhere near an auto fire if you can avoid it. It's dangerous. If you can't fix it so it works reliably, you're better off without it. Your safety is worth more than what you paid for an iStick.