Well so long as the message is "invalid password" you are not being hacked, although someone might be trying. To be on the safe side, make sure your router does not allow remote access and that the local acess password is changed to something other than the default password.
There are several different types of "unable to connect to the internet". For example, earlier today I could not access any web pages because the Plusnet DNS servers were down so the URL of the web page could not be converted to an IP address. The problem only lasted a short while. I did not restart my router but if I had done the problem would probably have been rectified by the time I did and I might have (wrongly) concluded that restarting the router had fixed the problem.
