Some sites block access from VPNs to prevent automated traffic or abuse, which can be frustrating if you're just trying to use them normally. Turning off your VPN, as you mentioned, often resolves the problem since it allows your real IP address to connect directly.

If you still need some form of privacy or flexibility without running into these blocks, you could consider something like 4G proxies. They offer a more dynamic solution by rotating through IPs associated with mobile networks, making it harder for sites to flag or block your connection.