ARM templates - Event hub consumer group creation fails with status code conflict, even though it is an incremental deployment

Hello All,

We are trying to do an incremental ARM deployment.

But the deployment behaves differently at different time:

1. sometime fails with the statuscode:Conflict
2. most time succeeds but the Audit log has this error with status code ‘Conflict’

<refer screen shot>

Since we are using incremental deployment.  As defined in this link , incremental updates does not re-provision resources that exist in the resource group.  Can some help us understand why are we getting this error.

PFA the error screenshot. 

Thanks

Madhan