Chinese 高墙 is actively banning IP addresses, we recommend you to stop using your vps for a few days to prevent the IP getting banned.Best is to shut down vps for a while during this period .
高墙 can ban any ssh port or proxy port by detecting traffic patterns .
Changing IP is not a solution as it will cause all IPs to get banned.
We are not sure when it will stop , please keep in touch with your chinese user friends or various chinese forums