I prefer flower so I stick with it, but my roommates like the concentrates so I hear them struggle with the same exact issue. And it seems like they're always getting new devices or carts to try and address this and yet it doesn't seem to make a difference. I think it might be an issue with the nature of concentrates.
For what it's worth, I have an Arizer Solo II, had it for 5+ years, works great, shows no signs of needing to be replaced and it's my daily driver for flower.