Issues with chat between 2 users

We have 2 users who are trying to chat. Whenever they do, it appears the AJAX goes into an infinite loop and does not load the chats. It’s only between 2 users at this point.

Version 2.4.14
Apps Engine Version 1.11.2
Database Migration 170
Database Migration Date May 6, 2021 12:05 AM
Installed at November 20, 2016 5:29 PM
Uptime 11 hours, 6 minutes, 32 seconds
Deployment ID pEYNmESH23MXiae6S
PID 2033
Running Instances 1
OpLog Enabled

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Hi.

I’m afraid you are a long way out of date there so it is not going to be easy to help you if you have hit a bug. Current version is 3.14.0

Have you check your logs?
Are you using GridFS for storage?
What clients are you using? Browser, app?