I faced the same issue and I saw a lot of locks generated by same statements and deadlocks happened on server during the same 3 minutes. 

Via deadlock reports I figured out that deadlocks happened with my processes and this system process in my case:
Proc [Database Id = 32767 Object Id = -993696157]

    select DB_NAME(32767)--NULL
    select OBJECT_NAME(-993696157)--sp_MSactivate_auto_sub

According to [this article][1] it is related to replication system task.


  [1]: https://social.msdn.microsoft.com/Forums/azure/en-US/a06e8e51-8c4b-4288-ae56-8e4ef42524fa/blocked-process-report-blocking-lock-type?forum=sqldatabaseengine