This Xbox signing out thing makes absolutely no sense

Solution 1:

This seems to be a common problem. This thread on Reddit lists a couple of possible causes and fixes:

• Someone else is trying to log in to your account. You can try changing your password.
• Your controller might try to log in inadvertently. Try turning this feature off.
• The Xbox Companion app might cause this problem. Try uninstalling it.
• Try updating your controller.
• Try hard-resetting your console.

Additional solutions taken from here:

• Try powering down and leaving your console unplugged for at least 5 minutes to clear out memory.
• Disconnect third-party headsets or other wireless connections that might interfere.
• Reset your router by powering off and replugging.