"An issue with the RAM"に関する回答Might be you are running lots of applications at the same time, or you installed some unwanted applications which should not be there in your computer so you have to cleanup your computer and remove all the bad and unwanted stuff from your computer.
"Why does my Lenovo Yoga 3 keep freezing?"に関する回答Might be you installed lots of unwanted application which should not be there. Or you are running lots of files at the same time. So please do one thing restart the computer then you should clean your computer.
"suddenly the phone restarted and sim slot1 is not working"に関する回答Remove the sim than restart the phone and try to put the different sim then it will gonna be work.