Hi everyone:
For the last couple days, Stadia hasn't been working at all. I reinstalled the APK but it made no difference. Whenever I manage to select my email to logon, it stalls for a minute and says "Something unexpected happen".
On a related note, my Shield TV Android app (on my phone) doesn't recognize my device when it's in the Stadia app. Only when it's out of the app or in the main menu. So I have to use my Bluetooth mouse to try and click something.
I'm running Stadia APK v2.45.343919453. Stadia runs fine on my laptop chrome and my phone.
Hopefully someone has the trick to fix this 
