For whatever reason, my parents' Apple TV lost its WiFi credentials. Parental controls are so insufficient, it cannot be believed, because I'm sure they clicked around and did it. BUT, not the point.
The point is, after WiFi was restored:
• Amazon Prime & Netflix required a restart
• Apple TV recovered
• Hulu required a password reset!!
If you've ever used a VPN client, you know too well that so many applications just can never recover from loss of network connectivity.