Dell Venue 8 Pro (5855) touchscreen & Active Pen blind spot

Couple of days ago I bought new Dell Venue 8 Pro 5855 tablet and new Dell Active Pen PN556W. Main purpose of tablet would be taking notes and sketching, as this device seems to be ideal for that purposes. However my model seems have some problems with touchscreen.

On the left side of the screen there is ~1cm line right from the top of the screen to the bottom where neither touchscreen or Active Pen seems to work. This is very annoying while using Windows, as if I will hold the tablet horizontally,  this blind-spot will either cover whole task bar, or if I will reverse it, menu items of any software running. On Windows I can at least try to calibrate both touchscreen and pen, but it's still not perfect and both of the options will behave badly around mentioned part of the screen.

What is worse is that this issue would also affect BIOS making it unusable as none of the groups of settings inside BIOS can be expanded.

So far I have tried:

- installing latest drivers for all of the tablet systems using Dell Command

- Updating touchscreen firmware

- Temporary replacing Dell Active Pen drivers with Wacom Fell Drivers

- Replacing Dell Active Pen batteries

- Updating Windows 8.1 to Windows 10

None of the actions I have taken seems to fix mentioned issue, and now I'm lost.

Is there anything else I can to make it work correctly, or is this indication of my tablet model is having hardware issue? Tablet was bought just this week, so it's still on warranty.