Hello Charudatta Bandgar ,
We set up my problematic machine completely with a naked installation of Windows 10 and then installed DL2020R2. Now it works, so it's not the hardware. It must be some process from our standard company configuration that makes DL stutter. We are now constantly adding applications to find out which process is the problematic one.
Even if DL works now, I still notice a strange behavior. When I click on Pause during optimization, it still runs. The play button is visible, but keeps blinking until the target is reached.