Tablet touchscreen too sensitive
No, there's no setting for the sensitivity. The touchscreen controller already filters the input it gets from the screen itself, so probably you wouldn't be able to filter out the faulty touches without also filtering out real touches.

What you describe sounds like a hardware problem. I'd recommend giving the screen a wipe with a damp, soapy cloth, then a rinse with a damp cloth, then drying it. It might or might not improve matters, but it's worth a try. If that doesn't help, you probably need to replace the screen completely.