Probably a driver issue. Check Event Viewer in Admin Tools for recent errors involving drivers. Check Device Manager for any devices with issues.
Any recent updated drivers which might have gone in wrong?
Always a good time to: 1 - clean out dust, 2 - make backup, 3 - run anti-malware in SAFE mode, 4 - check SMART status of HDD & SSD, 5 - make a recovery disk (IMPORTANT if UEFI !!).
If you think you have cured the issue and everything is now running right, consider defragging HDD, running manufacturer's maintenance utility on SDD and making a better backup.
A good backup is a better backup if it has 2 copies.