Hi,
For intermittent issues, Live environment is needed for troubleshooting.
Azure support can help. If you have access to raise a support ticket go ahead.
Else send an email to azcommunity@microsoft.com with your subscription id, I will help you to get a one time free support ticket.
Include this message "jakaruna-msft - Intermittent BlobDownloadMiscError while starting task" in the subject. Also mention the url of this thread in the email body.
Once your issue is resolved, feel free to post the resolution here and click on "mark as answer" for the benefit of the community.