artist 12 2nd gen, pen pressure keeps malfunctioning

As the title says, my pen pressure keeps malfunctioning :(( one second it works, and the next it doesnt. It keeps doing this and I dont know what to do. I tried the "# Use windowtab" thing and this doesnt work, unticking the windows ink works - but only for awhile and the problem starts again. I tried ticking and unticking the windows ink, but this time it doesnt work.

I am at my wits end :(( please help - I just really want to draw :(