Connectivity Issue with Oracle Free instance

I have an oracle always free tier instance running node-red which reports as RUNNING in the console, but periodically goes down.

I notice it goes down because node-red does not work and can't connect through SSH.

If I use tnc <IP_ADDRESS> -p 22 command (on my powershell terminal) I do get:

ComputerName     : <IP_ADDRESS>
RemoteAddress    : <IP_ADDRESS>
RemotePort       : 22
InterfaceAlias   : Wi-Fi
SourceAddress    : <IP_ADDRESS>
TcpTestSucceeded : True

but cannot connect when trying to ssh.

In the health monitor I get time periods without data as shown in the following image:

Rebooting the instance does allow me to connect again and the health tracker gets data again