We are not aware of the reported behavior but, unfortunately, the provided information is not enough to determine what is causing it. an you elaborate a bit on the exact configuration you have, the controls you are using in your project? Can you search for any failing requests on the page through the developers' tools of the browser?
Can you also try to isolate the code needed to replicate the hanging into a simple runnable project so we can reproduce it and examine it further at our end? Which is the version of the control your are using?
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