Some users may see unnecessary AJAX calls being made from a browser page, which prevents the flow of EUM data.
This issue is due to the default limit of reporting 50 AJAX calls per page, and after reaching said limit, any additional calls such as Adrum beacon POST requests are dropped.
To resolve this issue, there are two options.
Limit the XHR (Ajax) monitoring to only specified calls.
See Limit XHR (Ajax) Monitoring to Specified Calls
Increase the limit from the default of 50 to a higher value.
See Limit the Number of Ajax Requests