The self-hosted runner: gcc-10.3.0_openmpi-4.1.6--050d2029-a23d-4e80-a8a0-d656d5e74c9b lost communication with the server. Verify the machine is running and has a healthy network connection. Anything in your workflow that terminates the runner process, starves it for CPU/Memory, or blocks its network access can cause this error.