free tier t2 micro Ubuntu 20.04 LTS instance keeps hanging ?

Hi I am migrating from Windows to Ubuntu a website and hence created a Ubuntu instance. The instance works for some hours and suddenly one cannot SSH into the instance. The Instance reachability most time shows instance not reachable. Rebooting a couple of times gets the instance running. Any solution to get a dependable instance running ? Did not have this problem in Windows Instances.