Why did the Digital Ocean server become unavailable after resize?

Question

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After about 5 hours of server operation after resizing the VPS on Digital Ocean, it became unavailable.
Resize was from 2CPU/2GB RAM to 12CPU/32GB RAM
Doesn't respond. I went to the server console from the admin panel, ping and tracing to any hosts does not work.
Wrote in support - I'm waiting for an answer, but they answer during the day. I would like to know if anyone has come across this situation before.
We managed to raise the server by making resize 1 tariff lower (16GB RAM)

Answer 1

the active item needs to be assigned a class to begin with

Answer 2

Go to the server console and check