No internet/connection after droplet reboot

After rebooting Ubuntu 18.04 Droplet I couldn’t access it via SSH. Then I realized that I don’t receive any response when pinging its IP. I connected to my Droplet through DigitalOcean built-in terminal and tried to ping other remote servers but this also didn’t work. So it seems that my Droplet is disconnected from the internet. I tried rebooting, shutting off/turning on. Nothing helped. I tried to Google for possible reasons and searched DigitalOcean’s QA section but didn’t find any working solution. Here is what I found so far:

• if i run “sudo ip link set eth0 up” it returns "Cannot find device “eth0”
• if i run “ifconfig -a”, there is no eth0, only ens3 and lo
• if i run “dmesg | grep -i eth”, i get “virtio_net virtio0 ens3: renamed from eth0”. if i do the same on other Droplets (where internet is working) i get

“virtio_net virtio0 ens3: renamed from eth0; virtio_net virtio0 eth0: renamed from ens3”

i.e. eth0 is renamed to ens3 and then back to eth0. So maybe if I managed to rename ens3 to eth0 on my broken Droplet I would be able to restore internet connection but I don’t know how to do this. Also I am not sure why it got broken in the first place. I created a support ticket for this but i didn’t get any response yet.