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Try recalibrating the touch screen. Devices with touch screens need to be recalibrated in order to respond properly. The greater the use, the more often recalibration is necessary. I recalibrate my phone once a week. I hope this helps.
You may have dust accumulation around the edges of your touchscreen, between the screen and the case.
Try using a can of compressed air. Gently press down on the edges of the touchscreen to expose the gap between the screen and the case, and shoot the air in there. This worked for me when my Treo 600 touchscreen stopped responding.
I heard this happens after updating the Treo 650 with the new version 1.17. Is this your case? If so just remove the new update...
Anyway, you can try the soft restart or even Performing a system reset(from the user guide p.170):
Performing a soft reset A soft reset is similar to restarting a computer. If your Treo is not responding or
you have trouble synchronizing with your computer, a soft reset may help.
1. Press the Battery Door Release button and slide the battery door downward
to remove it from your Treo.
2. Use the stylus tip to gently press the reset button on the back of your Treo.