Could be the hard drive starting to fail so backup all your data to another drive or optical discs, then test the drive with
Hitachi Drive Fitness Test for DOS which loads from a bootable CD. Download the
CD Image from here:
http/www.hgst.com/support/downloads/legacy-downloads#DFT
Create a CD from the CD Image file using IMGBurn: http
/www.filehippo.com/download_imgburn/
Start up your Satellite and place the CD in the CD drive.
Shut down your Satellite.
Now switch it on again and
immediately press and hold F12.
When the boot device menu appears, highlight the name of your CD drive and press <Enter>.
Laptop should now boot from your CD.
When a two-item menu appears, select the first option (ATA) and press <Enter>.
Test hard drive using the Extended Test for thorough testing.