I received my replacement today. Bought original June 2021 and it totally quit September 2021. Before it's death, the water chamber lost the ability to click into place and stay on but I was able to find a workaround. Batteries needed to be changed and opened a brand new, unexpired package and it never turned on again. Did all the recommended troubleshooting and called company and voila - a replacement. I suggest keeping your receipt and all paperwork "just in case". Company was easy to work with. Price point of this is great and I LOVE IT. I was just disappointed that it malfunctioned.
I really like the settings and easy use/recharge. HOWEVER my unit has kicked out the water pik stem repeatedly . I had to switch (new stem). Don't know if this will continue. That would be a bummer!!