Sometimes getting error 1504 and error 1891

I am in the process of developing a web CRM application that will use the Zoho document viewer and editor to allow users to view or edit documents online. I have noticed that if they open a document, then close out and go back into that document within the next 2 minutes or less, that they will often get an error. If they wait for another minute and then try to get back into the same link, it works just fine. Any ideas?

Zoho Desk Resources

Desk Community Learning Series
Digest
Functions
Meetups
Kbase
Resources
Glossary
Desk Marketplace
MVP Corner
Word of the Day

Topic Participants
Greg Conely
Sakthi Kirubakaran

Sticky Posts
Zoho Office Integrator: Moving to the all-new Zoho Sheet
We introduced the latest version of Zoho Sheet—Sheet 5—in early 2019. This new version consists of a new user interface, improved performance, and an array of useful features. As a part of this, we will upgrade our Remote API integrations to the new version's editor interface on February 29, 2020. Update: The remote API integrations upgrade to the new version's interface will be done on April 15, 2020. Here are some exciting enhancements the new version of Sheet offers for our API users: An AI-powered
Businesses prefer Zoho Office Integrator over Microsoft WOPI - Here's why
Businesses often have difficult decisions to make when building web applications that provide document management capabilities for their users. For example, what's the best solution to integrate with online office editors— Zoho Office Integrator or Microsoft