PROBLEM WITH LS SCREEN

I am having a problem with my LS screen that starts after the LS gets warm. The touch screen does not work in the COLLECT mode. I can work using the hard keys, but I cannot change the descriptions. The touch screen works in the COGO mode. The touch screen works in the STAKE mode. The touch screen in hard to get to work in the shut down mode. I upgraded the software recently. The LS is about 2 years old. If go back to the base and turn the LS off, lose my base data, and start up again, the touch screen will work in the COLLECT mode for a few minutes.
 
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