Try flashing the firmware. Sound complicated? Luckily, Sony rocks and this process couldn't be easier. Download the Update Service from the link below and follow the instructions. This will delete everything on your phone, but if the problem you are having is a software problem, this will solve it.
If the problem persists after this, it's a hardware problem. I would try taking it apart and cleaning it with alcohol. It may not be easily fixable if it's a hardware problem.
http://www.sonyericsson.com/cws/support/softwaredownloads/detailed/updateservice/w810i?cc=gb&lc=en
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