Trying to book ticket on my SBB app and keep getting "Error 4406". Tried friend's phone same issue.

Tried booking through desktop PC and it won't let me book either!
"An error occurred while processing your query."

I guess have to queue up at ZH HB like a good boy, unless it starts working again!

Yes, had the same this morning. With the app, it usually works if you restart it over and over.