Touch screen not responsive

What is your question?

My Lexus LS 430 navigation and controls screen is blank and is not responsive most of the time, though it starts working for a few minutes now and then and gradually becomes irresponsive. Sometimes it says that the external system is not connected. In the rare instance of working, it works for short periods esp when the car is either very hot or very cold. This is when I select my temperature, climate settings for next few weeks. I have heard simeone mention that it is the computer hard drive that is messed up and really the tiuch screen itself. Any proven repair suggestions and price fir fixing appreciated! Thanks!

What makes this problem better or worse?

Extreme temperatures ease the problem, else is persistent

How long has your 2004 Lexus LS430 had this problem?

3 years