gibson guy...
...I'll leave Handwriting and Punctuation 101 to others.
As a few folks mentioned, do something different, IE get our of your routine.
Suggestions: (things that have gotten me over dull spots)
Don't play for a week or two.
You said you've got some Dio down pretty good. Play leads over what you know if you haven't learned them yet.
Play something totally different for a week or two, in your case, get a pop acoustic book and learn some Jimmy Buffet or John Denver (harder than you might think!)
Find a song or two you like that are over your head a bit and break 'em down, listen to it over and over and get it RIGHT, concentrate on HEARING it and playing it correctly. You want it to challenge you, not defeat you.
When you're watching TV, try to figure out commercials or play along with a movies musical score.
Get you a DVD of something you can't do, titles like "How I'm paying for my Guitar Institute Tuition Until the World Recognizes My Brilliance" or whatever. I've yet to NOT learn at least something from every instructional video I've ever looked at.
If you're doing the same things routinely, it's gonna get stale. Don't turn your nose up at anything. Anything you do outside of that is naturally gonna add to your guitar vocabulary, round out your ability and make the old stuff fresh again when you get back to it. Instead of just knowing it, you'll master it and move on from there.
The short version of this is "When what you're doing isn't working, do something else".