Hello I have the s-6 lite tablet and for the life of me the touchscreen dosent work. Hasent been dropped, it's been well looked after and onky ha fit since Oct this year. The pen works fine but nothing with the touchscreen. It briefly worked once for a few days and that was it. Done a hard rest aswell but still nothing.
Before returning it though @Englandkeeomybones, as a replacement would come minus your personalisation, data and customised apps, it'd be worth backing up those things you don't want to loose and trying a factory data reset. This Samsung Members App also has a basic touch screen test under Get Help -> Go to tablet care -> Interactive checks that you could try. How does that go for you?