Why is my CPAP machine louder than it use to be?

When I got the machine it was whisper quiet. now every inhalation and exhalation can be heard across the room.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0

crwdns2942205:01crwdne2942205:0:

What type of sound is it making? Is it a whistling or whining sound? How old is it?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0