What happens when you try to print? Just 'nothing'? Have you tried powering the printer off then on again? If that doesn't work, uninstalling the printer driver and reinstalling it may help. Your symptoms are saying to me that your PC thinks the printer is offline - but normally, you'd get an error message to tell you that. Another avenue to explore is to verify that something hasn't changed your default printer setting such that your PC is trying to print to something else. I assume until now you've just been using the 'print' button - but what happens if you do the long winded thing and in e.g. Word, go to File, Print - where you can look to see which printer it thinks it's printing to.
Surface Pro (2017) vs Surface Pro 4