Performance Monitoring Codes Not Found

[Rasul8215]

I'm currently working in the react web app. I implemented the performance monitoring for my app everything is working fine but the performance monitoring transport service set timeout called repeatedly.
I cross verified with firebase console dashboard my all traces are successfully found even API request and custom traces every thing but the callback is not stopped.
When the callback function will suspend?
Why it's happen?
Please add the perf sample codes in this quick start project.