Iphone 3G External Speaker Not Working After Earbud Use?

When I work out I plug my earphones into my iphone 3G to use it as an ipod. The last few times I have used it, the external speaker stops working after I unplug the earphones. However, it I go into settings and adjust the ringer volume, the speaker will play the chime as it is supposed to. But still, the speaker will not work in regular mode for incoming calls or text alerts. After a few hours it usually starts working again, but I would like to find a solution to the problem. Has anyone had a similar problem and if so, what was the solution?

Could be dirt or lint in the earphone port.

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