After I leave combat, my druid has started switching between travel form and back to human form, regardless of what form I’ve chosen. I have to go kill something to get it to stop. My form is changing about once a second, so it’s very annoying. If I can manage to get in the air, it does maintain travel form, so at least there’s that.
Turn off Press-and-Hold Casting. It interacts badly with action bars that change when you change form, so it makes you change form uncontrollably.
It’s just plain bugged. There’s no real alternative.