You can always switch to periodic scanning, but please keep in mind that there is a performance impact associated with it. It shouldn’t matter much on the hardware you listed above though, unless the folders in question are huge and/or located on a spinning drive.
Edit:
I don’t think there are any known issues regarding the file watcher in Windows, but I’ve personally encountered some delays from time to time, usually when the OS was under very heavy load. I’ve also had a few cases, where the watcher just stopped working silently for no specific reason, which sounds similar to what you’re experiencing. It was very rare though, and I still don’t know what the actual culprit was 
.