Github actions job cancelled for no obvious reason - build

Question

I'm trying to set up a github actions script for a project of mine. The project is private at the moment since I want it in an RC state before the first release. As it is close to ready, I intended to set up an automated build now, but I'm seeing some strange behavior. The project is a simple c# library, and so the .yml file is quite simple:
name: .NET Core Desktop
on: [push, pull_request]
jobs:
build:
strategy:
matrix:
configuration: [Debug, Release]
runs-on: windows-latest
env:
Solution_Name: Replacement.sln # Replace with your solution name, i.e. MyWpfApp.sln.
Test_Project_Path: UnitTest.csproj # Replace with the path to your test project, i.e. MyWpfApp.Tests\MyWpfApp.Tests.csproj.
steps:
- name: Checkout
uses: actions/checkout#v3
with:
fetch-depth: 0
# Run build
- name: Run build
run: ./build.cmd --target pack --configuration ${{ matrix.configuration }}
Sometimes, one of the builds (Debug or Release, or both) fail with an entry such as
Terminate batch job (Y/N)?
Error: The operation was canceled.
in the log. I certainly did not cancel the build in any way. This may happen after like 3 minutes.
Am I running into the github build time limit (how would I know)? Or is there something else wrong I'm missing?