<human>: Can you summarize the given text in a few sentences?

Hi!

I have an 8 months old female cat. She is neutered and in good health. Usually a very happy, social and well-behaved cat.

But sometimes she gets these "episodes" were she just runs around an acts crazy. Usually it is just normal cat behavior, like she is letting off some steam or whatever, but sometimes she acts violent when doing it, her ears are back, her eyes are huge and is you approach her she will growl and try to slap you in the face/claw your eyes out. And she runs around the house (she has 3 of those cat-trees, and all of them get climbed in like 30 seconds). Sometimes she has to stop to catch her breath (heavy panting with mouth open), but then she starts again.

And since I am a worrier, I have started to get worried. I dont like the crazy running around part, but what worries me is the aggressive behavior. Is that normal?

If it is not normal, I have a couple of ideas of what could be causing:

- We have recently started training her with a litter kwitter. It goes really well and when she is doing her business she seems just fine with the new "arrangement". 

- Two out of her three cat-trees are recently bought second hand, so they might still smell of "other" cats. 

- We have been traveling a lot recently, leaving her with friends and family. 

- We have started to take her out on a leash and she LOVES it. I'm starting to think that she is unhappy inside?

- She is lonely and wants a kitty-buddy.

I appreciate any help!
<bot>: My cat is sometimes running around the house and being really aggressive. Is something wrong or is she just a little bit crazy (in the good way)?