Laptop randomly shuts off and restarts.

[KyleL89]

My Toshiba Laptop (Satellite L740) has been shutting off, then restarting at random time. I had cleaned my laptop's fan and reapplied the thermal paste. However, the problem still repeated itself. This laptop I've had for almost 6 years now. Can anyone advice me on this? Thank you.

 

[velo3100]

Have you checked your battery and charger?