That’s not really much info to get an impression of the problem, a video would be awesome to hear the nature of the “lag” and “stopping” and to see how the UI behaves. Hovever, my first thought is:
Have you tried increasing the buffer size in your ASIO driver? Some plugins are not doing well with super low latency and need a larger buffer to work with, things like reverbs and mastering plugins like Ozone.
*On that note, depending on the ASIO driver you are using, maybe try a different one. ASIO4ALL usually works great, make sure you have the latest, stable version of that.
The only other bottleneck I could imagine for now is data transfer from the disk / SSD.
Also, make sure you close any application in the background that is not neccessary and that there is no Windows Update or Windows Defender / Anti Virus scan running that might keep the system busy.
Aside from that, maybe it is one specific problematic VST plugin. Disable them one by one to check if a plugin is causing the issues. Maybe you need to update some plugins to their latest version.