My guess is that its bad contacts, ageing wiring.
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The wing mirrors get a bit of a battering from the environment unfortunately!!
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If you really wanted to sort it for cheap, take the mirror apart, get a multimeter, and check to see whether there's power getting all the way through from the main loom.
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I presume it would stop somewhere, and at this point you would need to renew wires, solder etc to sort it.
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Obviously check fuses first though as this is quick to do!!
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Good luck
![Wink :wink:](./images/smilies/icon_wink.gif)