The laptop started to go into sleep mode (randomly). What could have caused this?

Question

Iron

Notebook Dell Latitude E6540. After reinstalling the OS (Windows, from ten to the same ten), the laptop sometimes (1-2 times per hour) started to go into sleep mode by itself. For a second, the inscription Blocking appears and that's it. If you use the battery, then it is directly cut down (data and applications are not saved). I tried to remove the battery and use only from the network. The problem is gone. I would have thought that something was wrong with the battery, but before reinstalling the OS, this had never happened all the time (1 year from purchase). What could be causing this and how to fix it? I would appreciate any advice.

Answer 1

Or it's in the hardware, or in the drivers.
Enter BIOS - does the battery hold for an hour or does the laptop shut down?
Rearranged Windows - return to the original state of the laptop, or from a flash drive?
Draw your own conclusions.

Answer 2

90% it's a dead battery