Mine does it too, every time. It's like it screws up for a second and doesn't recognize pen pressure or just makes a line to wherever my pen is hovering. It's extremely frustrating. >n<

I also hate that I can be on a call or just listening to the volume relatively low and when certain ads play it's like SCREAMINGLY loud. And I have to tab out to lower the volume on it and basically wait for it to be over, otherwise when my music starts back I can't hear it. >T