Same problem here. Was working yesterday and now I’m having the same issues as reported by several of you (Echo responds but FiOS PVR does not respond to commands).
Disabled/Renabeled Amazon Skill.
Reset PVR.
Reset Router.
Reset Echo.
Voice Control Troubleshooting shows no issues.
Seeing how I'm not the only one to be having this issue in the last 24 hours could it be network related and out of our control?