Sorting issue in fetch data api

[Ishankoradia]

We are trying to fetch records of a kobo form using the following query parameters as follows :

The form has close 4,00,000 records.

The following server error is seen up when accessing some of the pages of the records.

The error shows only when we query on "endtime". We have also checked the data export and endtime field for all the records have data in a consistent format.