I'll use http://www.howtogeek.com/166140/you-dont-need-to-install-a-task-manager-how-to-manage-running-apps-on-android/ as fodder here.
While Android should task kill for you, I've found a reboot to be needed if I don't want to kill tasks.
So I bought this lenovo yoga 8 tablet for my mother like 2 months ago http://www.gsmarena.com/lenovo_yoga_tablet_8-5835.php
The issue is, after some time (30mins or more) after watching a lot of facebook or youtube, when you go back to your main screen aka launcher, the tablet goes insanly slow, you can't pass to the next screen or open any apps without it taking 5 secs or more, sleeping or waking the tablet doesn't work, so you have reset the device to give it back to normal. There was one time where I ran into this issue so I kept the tablet like that (without resetting) for hours because I had to work so I could check it out when I was back, but when I was back the tablet was already ok (5+ hours passed). So I assume after it goes slow it takes its own time to go back to normal, I haven't testes so I don't know the exact number.
I downloaded a monitor (OS monitor) expecting to see an app eating the whole ram but all I see abnormal is "Android System" taking about 30% CPU usage during the sluggish when it usually has 5% during normal times, and even after a "clean ram app" it still shows 500mb free out of 1gb, please check both this pics:
Do you think is there anything I could do to prevent this?