Paint tool glitzing out

i'm new painting on ps, , every time use use paint tool works few minutes , suddenly, without me doing far can tell, starts acting strangely.  instead of drawing when stylus on screen, connects draw straight line, it's playing connect-the-dots.  starts "beach balling" (ps only, rest of computer works fine) can't fix it.  ideas?

hi,

 

may know version of photoshop using, make , model of tablet using.

 

thanks

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