Why can't login my VPS with SSH-console

My new VPS was set up with Singapore server farm yesterday. Today, my ssh connection got disconnected twice unintentionally in 3 hours. The worst of all, it got disconnected for 1 hour or so just now, showing

** connection time out (port:22)**

and I felt annoyed so that I destroy my server image(I thought it is my setup was causing problem) and try to rebuild the whole server

Nonetheless, when I started over with a new server image, and tried connecting it with (new ipaddress and also my ssh-public key), it still shows “connection time out”.

Although the whole time, I keep one of my console “ping xxx.xxx.xxx.xxx” to give me a clue about the networking status. It looks obvious that the ping response time is quite poor to your server, sometimes it interrupts. However, I could always browser your digitalocean User dashboard all the time.