PARM error with custom brushes on multiple different files

Hello,

I have created multiple different files in illustrator v27 to v29, even tried beta. I create digital drawings from photos with my own custom brushes. I have used the elipse tool to create a tapered line art stroke and used the elipse tool to create a feathered brush with the elipse tool, a small solid circleinside a transparent large circle, which I blended using the blending mode with specified steps of 100. No matter how many times I recreate the brushes or start new artwork, the same "PARM" error message happens or "there was an error in applying brush stroke". I can work around by doing a single brush stroke, waiting for it to load and saving my work every 20-30 seconds, else when it inevitably crashes I lose my work. If I do more than one or multiple strokes in quick succession illustrator "not responding" and greyed out screen appears and I have to kill the program externally or through the tab right click close (though this sometimes doesn't work). My settings/preferences don't save upon reopening and if I haven't saved it close enough, I lose everything!

I called tech support and the problem was resolved momentarily, but it lasted only minutes. 

Please HELP!