radial gradient mask shape controls not working

After some time of use (let's say roughly after one hour of continuative use) when I apply a radial gradient mask it's shape controls (size, orientation) and red overlay doesn't work, so I can't move or reshape the mask... for some time deselecting the mask and then selecting it again, or moving the mouse out of the photo area, improve a little bit, but after some other minuts I have to restart Lr to get it working again.