I'm all but convinced Snorge is in the early stages of either Alzheimer's, dementia, or both.
I'm pretty much convinced of it. I watched my grandfather go through the changes and it's a horrible thing.
Looking over this list, it's obvious that quite a few apply to George:
Additional psychological and behavioral problems that often affect people who have dementia include:
Disinhibition and impulsivity
Constantly interrupting guests.
Depression and/or anxiety
He mentioned his fear of people not laughing at his jokes/applauding his singing in a recent show.
He seems very bothered by his haturz. Blackballing guests who appeared on Dark Matter.
Both of these could have led to the mustache incident. We don't see enough of George to know what his physical condition is.
Speech and language difficulty
Do I even need to say anything here?
Trouble eating or swallowing
Two words, pizza rolls.
Delusions (often believing people are stealing from them) or hallucinations
He still thinks he hosts a TV show, he thinks people actually want to hear him sing, every show is a classic, this could go on forever...
Memory distortions (believing that a memory has already happened when it has not, thinking an old memory is a new one, combining two memories, or confusing the people in a memory)
The Hawaiian studio, the remodeled studio that he may or may not have moved into yet, the whole email thing Art called him out on.
Wandering or restlessness
The constant need for a pet project or cause. The exercise thing, his charity efforts, protecting the grid, the list goes on...