A floppy is a very fragile and small memory device. Almost anything can cause data to be erased. If you are having issues the best thing to do is to run a disk check or "scan disk." This is a utility on most computers that will run a check of the disk that you specify and try to fix issues or let you know if you have bad sections on the disk.
Here is how you do it:
Double click on your My Computer icon. (Usually found on the desktop)
Put your floppy into the drive
Right click on the floppy drive
-You will get a drop down menu; select properties
A window will pop up and at the top you will see tabs; such as: General, tools, hardware.
Click on the Tools tab and select "error checking"
Check both boxes to try and fix the problem and recover bad sectors.
Then click start or okay. Let it do its thing and hopefully it will solve the problem. If not there really isn't anything that you can do to recover the data, and if you format the disk you will wipe it clean and no data will be on it at all.