Unit Tests Sporadically Disconnect on our CI:CD builds

Hi Karma team,

I'm part of an Angular project for my organization with a CI:CD build running approx. 1260 unit tests. We run these unit tests as part of a nightly build.

Our builds run the following command to launch the unit tests:
ng test [project_name] --browsers=ChromeHeadless --watch=false --source-map=false

After 921 passing tests, the unit test portion of our build fails with the following error:
Disconnected (0 times) reconnect failed before timeout of 2000ms (ping timeout)

This issue happens *only* on CI:CD, I never get it locally when running unit tests on my machine. Even then, we don't get this for *every* build. It happens randomly.

We're using Angular version 13.2.6 and the following Karma versions:
"karma": "~6.3.17",
"karma-chrome-launcher": "~3.1.0",
"karma-coverage": "~2.0.3",
"karma-jasmine": "~4.0.1",
"karma-jasmine-html-reporter": "^1.7.0",
"karma-scss-preprocessor": "^4.0.0",

What are some potential root causes we can troubleshoot to better understand why the unit tests randomly disconnect. Please advise. Thank you!

Start by reproducing the reported `ng test [project_name] --browsers=ChromeHeadless --watch=false --source-map=false` command in the CI environment and compare its logs with a successful run. The issue names no repository files or failing test; done means identifying a reproducible cause for the intermittent disconnect and documenting an actionable fix or configuration change.

Written by the indexing model from the issue text.