Iphone 4s Volume buttons not working and volume bar gone?

Since yesterday, the volume on my iphone has been playing up. The volume bar would appear and disappear and everytime i clicked the volume buttons, the volume icon would not appear ect?

Reboot the device. Hold the lock button until a slide to shut down slider comes up. Then slide. Then after it shuts down, boot it back up. It should work now.

Add head phones to your phone and it will be fine

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