A few years ago, Microsoft launched Modern Standby, a feature that is supposed to make Windows 10 laptops more useful in Sleep and Hibernation modes.
The feature allows your laptop to perform background tasks like finishing up downloads and system updates while the lid is shut.
This sounds like a good idea in principle, but it is having a massive effect on battery life.
Users say it's also causing their laptops to overheat even when they are closed.
Tech site Notebookcheck recently ran tests on three newly-released Windows 10 laptops - the Dell XPS 15 (9570), Asus ZenBook 15 and Lenovo IdeaPadS740 15 and found a range of problems while in Sleep mode across all three models.
The Lenovo was consuming 27.4 watts of power when the laptop was in sleep mode and the lid was closed.
They said a normal laptop should consume 2W of power while in Sleep mode.
Some users have said that up to four hours of battery life is being drained while their laptops are closed.
The Lenovo also was said to reach temperatures of 50 degrees Celsius while hibernating.
Experts say that laptops should never reach a temperature of above 35 degrees Celsius.
Of course, overheating and high power consumption while in Sleep mode both have a massive impact on battery life and Notebookcheck say Modern Standby is to blame.
Unfortunately, there’s currently no simple way of disabling the feature.
There have been workarounds posted to online forums, but these could cause more problems than they solve.
While Dell have released a “Modern Standby Performance Improvement” for XPS 15 owners, it is unclear if Microsoft plans to make any changes to Modern Standby to solve the problem.