Prompted to log in when already logged in

[CodingItWrong]

From time to time, I'm prompted to log in when I start the app. Force-quitting the app and restarting it always fixes it: I'm automatically logged in then.

Please let me know if I can help try things out to make it easier to reproduce this, or if I can try a beta to see if it's fixed!

[darkroastcreative]

Having this issue as well as of late, both on my iPhone 7 Plus and my iPad Pro 9.7. Software versions are listed below for each device. Please let me know if there's anything I can do to aid in finding a solution.

iPhone 7 Plus:
iOS 10.3.3
Mustor 1.10

iPad Pro 9.7:
iOS 11.0 Public Beta 4
Mustor 1.10