Rendering in viewport constant loop

Hello,
Every time I use raytracing on the 4 the 4 default viewports, front and right view goes into a loop and starts to display abnormally until it goes to black. I have never had this problem before in Rhino 6 and earlier versions of Rhino 7, when I use the Render command on the problematic viewport(front and right) it renders well. What could be the problem? I’ve tried both Optix and CUDA with no success. Although sometimes I get the full cycles(1000 or 500 or 300), most of time it doesn’t work.

Hardware is nvidia rtx 2070, i7 8700 16gb ram.

Thanks for the report, I filed this as https://mcneel.myjetbrains.com/youtrack/issue/RH-65147.

RH-65147 is fixed in Rhino 7 Service Release 10 Release Candidate