What version of steamOS are you running (stable, beta)? Has this been an issue across more than one update? Something seems wrong with the network/driver on this. A while back I had issues with discover not actually writing to the disk at more than a few Kb/s. There’s a few things you can try:
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Switch update channel to force and update. You can switch to beta from stable and retest. If this fixes it but you want to stay on stable switch the branch back to force another update back,
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Hold I think it was volume minus and power to reach the boot menu from powered off. Try it on both boot options to see if the current boot partition has a bad file on it or something.