My computer. hi. for some reason my laptop wont detect my devices, such as my mp3. but if i go to

Question

hi. for some reason my laptop wont detect my devices, such as my mp3. but if i go to device manager and uninstall my mp3 and then search for hardware changes it will detect my mp3 and work fine for about 20 seconds. can you tell me the problem and how can i fix it.