x8052

Dear all, i have just bought a 65 LA 970V-ZA smart tv and there is a major problem. At first use the tv runns great. but after i use web browser for a few days it then runs out of memory and the browser does not start at all. Youtube runs fine though. If i perform a factory restore it then runs fine for a few days again. Also although it recognises the usb i am also unable to install apps on there. I use the latest 4.27.02 firmware. Please help.