Windows Server 2008 R2 SP1 functioning solely as print server.
Often print jobs from client machines seem to 'disappear', no error message, no job appears in queue on print server. This will happen for all users trying to print through the server. As soon as a test page is printed from the server, to any printer, all printing returns to normal and all users are able to print from that point. Some days this will happen 3-4 times, and other times we will go a few days without any issue.