I have been having a lot of trouble this weekend with the ArcGIS collector app on an Android Tablet. Firstly it is not syncing any data that was collected, and an error message comes up saying unable to synchronize edits (there are about 40 points that were loaded and edited, with attachments). The most frustrating thing this weekend though was that the map that I loaded that contained all of the layers that have been working previously offline now crash the tablet. Each time I download the map it appears to have worked, but then when I open the map in offline mode I get the error message that "unfortunately, collector has stopped". Then the app keeps crashing when I try to re-open the app.
This resolves itself if I manage to remove the map that I downloaded, but I have no idea what is causing this. I have re-made the map, the layers, and checked that everything is as it should be but nothing has worked so far. Please help!