Numbers keeps freezing when making changes
I am not completely new to Apple products, but I am rather new to the MacBooks. I recently got a MacBook Air for Christmas last year and haven't used it a ton. I am starting to input some of my side business information into Numbers to keep track of sales, costs, profit, etc. I have created a spreadsheet and it does include some calculations. The other day I was messing around with it trying to make it more detailed, I wanted to add comments to a few of the cells to be able to explain those sales a little more in depth.
Once I inserted the comment box, Numbers froze (rainbow spinning wheel), I closed the program. Reopened it and tried again and the same thing happened. I didn't think much of it and figured I would just wait a few days and try again. I tried again this morning and the same thing happened.
If anyone has experienced this problem or if anyone knows what steps I need to take to correct the problem any help would be greatly appreciated. I would love and need to be able to do so, so that I don't lost any of the information, data, and calculations that I have already entered. Thanks in advance and I look forward to hearing from anyone with help.
MacBook Air, OS X Mavericks (10.9.4)