Cubase 12 hang after longer session time

I’m running Cubase Pro 12.0.20 on Windows 10. For the most part, everything is solid. However, if Cubase 12 has been running for several hours, enabling a disabled instrument track will freeze it every time. The same thing also happens if I import a track archive. The only way out is to end via Task Manager. After restarting, Cubase 12 offers to send a log file to Steinberg, and I always do so. This may be caused by another plug-in, but I don’t have any way to tell that.