Account-related issues, such as auto log-out, are now confirmed bug affecting a lot of users.
Our team is aware of this and is working on a permanent solution to it.
Until we can release a permanent fix, you can try this workaround by following these steps:
1. Log in to Manga Rock & Back-up data
2. Perform "Clear App Data"
Go to your Device Settings > Storage & USB
Go to Apps Storage > Manga Rock
Tap "Clear Data" then relaunch Manga Rock
3. Log in to Manga Rock again
Clearing App Data should solve the problem. However, if you still encounter the problem, please contact our support team by using the in-app support.
Affected version: Android 3.0 and above
First reported date: Dec 12th, 2017
Resolved date: TBA