It happens a couple times a day that VS PHP loses it's connection to the remote server. Usually I can reconnect by hitting the refresh button in the Solution Explorer.

However, today after doing so and trying to save a file, it pops up an error box saying 'The operation could not be completed. The parameter is incorrect.". When I try to shut down VS PHP in order to restart it, I get an error box saying "The operation could not be completed. Not enough storage is available to complete this operation."

Had to use ctrl-alt-del to kill VS PHP