Hi Davidw64,
Welcome to Sony Community!
We apologize for the inconvenience. Kindly visit this link and follow the instructions carefully. https://us.en.kb.sony.com/app/answers/detail/a_id/37394/p/48903%2C49902%2C74256%2C85637/c/65%2C66/kw/touch%20screen%20stop%20working. I understand that you already did some of the steps here, I suggest that you perform or continue the steps that you haven't tried yet.
You can also press the ASSIST button (while the unit is off), on the recovery page, try to use the touchscreen and replicate the issue.
Regards,
Jen
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