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got to settings>apps>running and chose the one you want to stop from running and also use the multitasking button by the home page to close apps
yes you can go to settings>apps > all select the app you wanna stop and click disable
It could be low memory have you got a micro SD card? Also try installing this it helped me a lot
Ucef,how often do you restart your device?It needs to be done regularly,every 1-2 days.
The RAM memory needs refreshing,it is volatyle,it keeps data until you restart.