DMS migration for document db from engine 4 to engine 5

Hi Team,

we upgraded document db engine from 4 to 5 by using DMS. DMS services was used for migration (full load and on going migration) But we see data missing in migration example we have
234,089,011 new document db engine has only below doucments... In DMS it shows table load is done 232,20,333 There is a data loss of 2 days ..example DMS task was started on 28.08 11 AM and it was completed 31.08 (approx 8 30) For these days data is missing.. Is this expected behaviour? After that again data is present

Compelete data is missing now again we have to use import export way to migrate data.