可能是什么原因导致WPF应用程序固定CPU并锁定某些计算机上的应用程序而不是其他计算机？

Stumped here. Posted a similar question before. We have a pretty large WPF app that on some machines runs great, but on others, all of a sudden, one of the CPU cores gets pinned at 100% (just one core) and the app freezes. It usually seems to happen when showing a context menu or a combobox drop-down (i.e. Popup controls) which is why we can't debug this since no user code is executing at that time. It's driving us crazy because again, on most machines it runs fine, but on a few, it freezes.Stumped here. Posted a similar question before.