Question about Sony Ericsson T303 Mobile Phone (Shadow Black)

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The buttons on my T303 work erratically. It started with the "back" button but has now spread. I have to press back a number of times for it to work. Seems to be time related like the phone's doing something else. I though it might be a memory shortage so deleted all texts and photos. This hasn't helped. In fact it's got worse. Now, if I receive a text all buttons stop working. It seems I have to power cycle then wait a bit for any of the buttons to work. Again it appears to be time related.

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