Hi, I got my tablet about a month ago, and I have been having issues with the drop down menu and the s pen. Sometimes when I unlock the tablet the drop down menu at the top of the screen doesn't work for ages, and whenever that is happening I can't access the air menu with the button on the side of my s pen. It also tends to lock itself every now and then when i'm using it. Is this an issue I should be taking back to the store? Advice would be appreciated.