Hi Chris.

I presume your Vaio is still within warranty so it would be sensible to register the problem with Vaio Support.  They may have seen the problem before.  Clearly, something is not right.

As your Vaio has Keyboard/Mouse/TouchScreen inputs and the problem is intermittent, I expect Vaio Support will suggest reinstalling the Operating System.

All you can try first is to eliminate any 2.4 GHz wireless interference by making sure you are not using any devices that use the 2.4 GHz radio band too close to the keyboard.  Lots of ordinary appliances use this band including wireless LAN, microwaves, cordless phones, bluetooth, radio controlled equipment etc. etc.  Interference is rare in these ISM Bands but it is worth checking along with any nearby large metal items.

I don't have to tell you how difficult it can be to isolate intermittent problems like this!