Hi & welcome.
I had two of the Ijust2's die at almost the same time, both with switch problems. You are right though the tanks are still good (I have 4 of them), particularly for clouds but less so for flavor. I'd suggest you look at acquiring some other attys too and you'll soon see the limitations of the Ijust2's, though I still use mine. You'll find some juice/flavors work better in some atty's than in others. The Ijust2's I'll use when the juice taste is too much 'in your face', too strong and/or candy-ish, as the tank will mute those flavors nicely.