Hi all,
I experienced this problem today as well. I too am running masterCAM like the OP. I am also using two monitors. I noticed many users experiencing this are using graphic intensive, professional software as well, which seems to be the only thing in common.
I noticed the feeds process wating up all of my RAM when I started masterCAM, and opened a file. I received an "out of memory" error message and masterCAM crashed and my second monitor became disabled. I then ended the feeds process via the task manager, but it didn't improve and the animation during window maximization chugged. I disabled the news and events in the task bar, and restarted which seems to have stabilized things so far.
I did not use any graphic intensive program nor do I have MasterCAM, I was watching youtube on Edge when Edge crashed due to the process hogging all the RAM.
Sadly no trend to be found thus far.