Yeah, similar thing happened to me but the I had the backup. The cashu stuff is really experimental, feels like its barely getting out of its alpha stage. 

BlokchainB

Was it cashu.me?

I haven't had any issues with the SN PWA.

TheWildHustle

Stacker Saloon

saloon

Shortly after this my cashu wallet just randomly reset. I didn’t back up the wallet (my fault) lost about 400 sats

But what I am learning is PWAs are very unstable. Even SN as a PWA is unstable.

I think native apps offer a better user experience 