This time it has hit my tablet. Recently, the pen pressure is gone and the cursor tends to fly off in different directions before going back to where it should be, causing a point. Certain points of my tablet seems to be especially effected by this, pressure applied worsen this. Nothing was done recently to cause this. I shouldn't be surprised considering the tablet's age.

A new one should be here this week so nothing should be too disrupted. It may take time to get used to as it is a different type, but it should use the same driver.