A kill switch can block traffic when a VPN connection is unavailable, depending on the product and configuration. That protection may explain why the device appears offline after the VPN stops. Use the VPN's documented status and controls.
Check the whole connection
If every internet application fails after the VPN disconnects, inspect its status before changing the streaming account. A player-only fault may have another cause. Note whether the VPN is connected, reconnecting or intentionally blocking traffic.
Respect the privacy choice
The feature exists to prevent unintended traffic outside the tunnel. Do not disable it without understanding that effect. Reconnect the VPN through its supported process or deliberately choose the appropriate configuration for your needs.
Retest without confusion
Once the network state is clear, reproduce the original media issue. Avoid changing VPN, DNS and player settings simultaneously. That makes it possible to distinguish a deliberate traffic block from a source or authentication failure.