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The application stops working correctly across all open tabs as soon as more than five browser tabs are open to the same environment.

Answer

Check whether the environment is running HTTP/1.1 instead of HTTP/2 — browsers cap the number of simultaneous connections per host under HTTP/1.1 (commonly around six), so once that connection ceiling is hit across open tabs to the same host, additional tabs can starve the others of connections; upgrading the environment to HTTP/2 removes that per-host connection ceiling and has resolved this exact symptom.

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