Wireless Earbuds

I usually listen to music with my wireless earbuds while cleaning or spending time in the living room. When I go back to my room, I put them in the case and carry them with my phone. At that time, I have dropped the earbuds case on the floor a few times. This morning, while ironing my clothes, I was using my earbuds. I listened to my favorite song, so I felt strange that I heard a sound of gentle flowing water in the background of the song. I thought that it must be my fault because I had dropped the case before. Fortunately, the water-like sound has disappeared now. I really need to handle them carefully.