Noisy Floppy Drive

The floppy drive in my PC starts spinning by itself once in a while (about two or threee times a day, maybe more often). There is no apparent problem, because does not give me any errors and the floppy works good, but the noise is annoying and I am afraid that with time the floppy drive will go bad. Seems like is schedule to try a back up to a floppy disk in certain schedule. What can I do to fix this problem?