FormController getFilledInFormXml returning null

[mauricioguell-sagaci]

Software versions

JavaRosa 2.17.2, problem reproduced with Redmi 4A, Android 7.1.2, 2GB of RAM, low space in the disk.

Problem description

FormController getFilledInFormXml starts returning null if a few devices when the survey is very long.

One of the surveys of my app is really long, it can take an hour or even more, and you have to take pictures. Suddenly, some of the users are losing the survey, because getFilledFormXml starts returning null to them, in spite of having the survey and being able to answer the questions (they are not able later to send it).

Do you have any idea of what could be happening?

Cheers