Xperia Z2 Tablet software and hardware (?) problems

I've purchased Xperia Z2 Tablet (SGP512, 32GB/WiFi) about a month ago and have experienced some problems till now:
touchscreen won't respond very often both on lock- and homescreen as well as in apps; it seems a lot of other people have these problems, too, but I wanted to mention it again
also UI is laggy sometimes when navigating on homescreens or the app drawer
when navigating in apps the device sometimes makes weird noises (especially when scrolling down in Google Play Store), it's kind of a crackling sound, not very loud but annoying and I'd rather have it disappear
microphone quality seems to be bad, I've been told that there'd be quite a loud and annoying static when chatting over VoIP (Skype) 
I'd be really happy, if there was a solution for the problems above.

Occurs with my z2 tablet also (the touchscreen problem), gets extremely fustrating at times.
Hopefully it's a software issue, not a hardware issue.

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