I have a Collector user out in the field using an offline web map featuring an ArcGIS online hosted feature class. He has been using this successfully but is now getting the following error messages "Abort due to constraint violation" and "Unable to open the database file - Create virtual table for selection failed" when he tries to collect a point. It seems to be intermittent. It is now allowing him to collect a point but not delete a point. I have not been able to replicate the error with his login on my device. He has tried to remove the map from his device and download again and it has not solved the problem.