Until recently, WSUS node keeps crashing. I found that there are two fixes that usually stop the WSUS node from crashing. The first fix is to close the WSUS node, then delete the files from the %appdata%\Microsoft\MMC directory. The second fix is to improve the performance of the server.
You can also do additional troubleshooting by running C:\Program Files\Update Services\Tools\WSUSUtil checkhealth
then checking the Application log in Windows Event Viewer.