The MU app has always been buggy, but its been getting worse. The new problem is that if you leave it in the background for too long the session times out which locks your account requiring a password reset. The recommended solution from customer support is to force kill the app every time you stop using it.
This is an insane problem with an insane solution. The developers really need to get it together.
EdCorcoran about Marvel Unlimited, v2.9.5