Why is my helicopter in stable and wobbly while I'm using it?

I was flying inside my house and it was dangerously close to the wall so I tried to get it into the middle of the room but instead it flew straight up, hit my high ceiling, and fell straight down. When I tried to start it again, it was wobbly. I checked the stabilizer and even took out the shell cover, everything looks normal. What should I do?

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