That is a common problem in that set and i would advise, if still under warranty consider that but if not, then repair may not be cost worthy as it will involve replacing the circuit board to the display unit.
hope that helps.
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Try this procedure to drain the static energy of the phone.
1. unplug power from base
2. unplug phone connection from base
3. remove cover and battery from handset
4. wait 10 minutes
5. put battery back, reattach phone connection and power
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