Why in my Nexus 5(6.0.1) recent apps are not showing? even though i have not cleared it.

[AC Question]

I am using my nexus for about 2.5 years and i am happy with the performance. Recently i am facing issue regarding my recent apps, whenever i want to switch with apps opened already, the function is not working as already all the application are closed. I am unable to find solution for this issue and it is making difficult in multitasking.

 

[the tall guy]

Hi, so when you press the recent app button, do you have any apps open or do they all automatically disappear?