Aquara H1 switch (no neutral) - suddenly "died", no blue light on it

I have an Aquara H1 switch (no neutral) connected to a bathroom fan. When I bought it I triple checked that it's compatible, I don't remember the details now (it's been like 3 years) but I confirmed that the power it pulls and all that should be okay.

Suddenly, it stopped working. It's offline in Home Assistant (my hub), pressing it doesn't toggle the fan, and the blue light on it is off completely.

Recently we had a few short power cuts, but I have a ton of other Aquara switches (they are doubles, but also the same model and no neutral, installed the same time too) and they still work fine.

Is there any way to fix this? Or do I need to buy a new one?