I also have this bug or one that is very similar. Unity stops responding to touchscreen single clicks after a period of time. I am still able to use multitouch features like swiping with four fingers to show the dock. I examined the input device in xinput and it showed clicks and releases while the bug is in effect. I will be having this problem daily, so please let me know if I can help. When it happens I either log out and back in or use the stylus.
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