Hi Everyone. Just had similar problems with my Yeti 2015 Amundsen 2. Initially started with not being able to input some post codes then the map jumping around. Skoda dealers useless, just want to charge silly money to possibly diagnose which seems to be a known fault. Searched locally for an 'Infotainment Expert' to no avail.
Finally found a company called SATNAV SYSTEMS (UK) Ltd. At last someone who knew what they were talking about. Hamid diagnosed the problem in a couple of minutes as screen digitiser failure, a known problem to them with 2015/2016 Amundsen 2 units, They even keep the parts in stock. Fixed in an hour but with a bill of £718. Ouch!
A way to test for this is to put the screen 'beep' setting on and touch different parts of the screen. Some parts will not beep. Apparently it starts with just a few areas then spreads as mine did and then takes over the screen. They call it 'Ghost Finger'.
THIS SHOULD BE SUBJECT TO A RECALL. I will be contacting Skoda UK but I feel I will get the normal dealer type response of 'Never heard of this failure' or something similar.