I agree with your reservation about Manjaro. However, you did get one thing wrong:
They pushed an update that caused steam to uninstall your desktop environment. Famously covered by linus tech tips…
That was Pop!_OS (unless it happened a second time??)
Mine updated just fine, so you’re almost certainly experiencing a network/routing issue. I’d suggest you make sure your phone can ping/traceroute the repo and troubleshoot from there.