Issue details can be found on following link:
Only happens on devices with Android Nougat and above.
TransactionTooLargeException happens when an Activity/Fragment is in the process of stopping, that means that the Activity/Fragment is trying to send its saved state Bundles to the system OS for safe keeping for restoration later (after a config change or process death) but that one or more of the Bundles it sent is too large (i.e. greater than 1MB).
In our case, this was happening on Units navigation screen.
Only test on devices with Android Nougat or above
Enable the `Don't keep activities` option in Developer Options on the phone
Enrol in a course that has lots of sections/subsections/units e.g. https://www.edx.org/course/mechanics-review-mitx-8-mrevx
Open the unit navigation screen
Press next/previous 3-4 times and then press Home button
Wait for 3-4 seconds and the app will crash