Polygon Lasso Tool keeps closing

i use this tool a lot and have experienced issue over last couple of months. I selct tool, then as normal start clicking over and image to make selection. The selction points I make then dissappear and i have to start again. usually the same issue repeats 2-3 times, teh new ai box appears every time, then it will work.
My PS is alays up to date as is my operation system.
I have two desk tops,  a Ryzen chip at home office, a Intel(R) Core(TM) Ultra 7 265 (2.40 GHz) at Work office , boteh with GeForce RTX cards and 32 GB of Ram.

I have been using Photoshop since v.5.0 and know what I’m doing with the program.