Symptoms
Some instances of Inspiron 7559 systems not correctly "waking" after the system resumes from sleep have been observerd. These are systems with a BIOS version earlier than version 1.0.4 and is due to power saving setting. This may lead to multiple system isuses includingg slow responding times, audio glitches, cursor sticking, application lags, etc.
Resolution
To resolve these issues please update your system BIOS to 1.0.4 or later from the Dell Drivers and Download site. For information on your system BIOS and why it is important to update this please see our Knowledge Article - What is BIOS and How to Download and Install the latest BIOS?
