Barring comes out of yoyo plz help

so I was playing around with my yoyo and then it became responsive so i checked the bering and everything was fine so when i put the yoyo back together and when I put the Bering on it did not stay on

What kind of yoyo? Does it use spacers to hold the bearing? If so did you put them both back on? Maybe a picture of each half would help. Your description is not very helpful.