For some reason... when I'm coloring in SAI. The brush, watercolor, and blur tool keeps leaving effects. .. sort of like the brush tool with a painbrush effect.( I don't know how to describe it)... In short its totally not blurring like it should or blending the colors either. It can, but you clearly see the strokes.

I fiddled aound with my tools, making sure I had no effects on, but it still keeps showing up. I'm starting to think it's my tablet. It's a wacom bamboo pen & touch (the touch feature is a total nuisance lol, i thought it would be great :D) and I had it since 2013.

Is it time to get a new one?