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Did you try update your drivers ? revisit shop where from you purchased battery, replace your battery Listen, do not update simulations, if you have multiple updates, select only few of them and then update with them, like that, daily update with few updates, that exactly with my OS, thats not a Mac, that is Windows 8.1, but after i replaced battery, whenever i update my window, window just crash.
Did you install any 3rd party Launcher ? like Go Launcher, or Nova Launcher, these launcher have ads, you can stop them by going to "Launcher Settings", other wise uninstall these launcher, and use default one. or may be you are having ads because of installing any other apps, just recognize from which app these ads are being shown
You can resolve this issue simply by putting your heavy apps on sleep Mode. -Press "Windows Key + R" together. -Then "RUN" will open, type command: msconfig -Then, select "Selective Startup". -Go to "Services" tab. -Deselect the apps those you don't need to startup while booting up device. Also, i would recommend you to install "Avast 2017-18" antivirus. Run this app, and also install along with "Avast Cleanup", this scan your pc and would give you suggesstion to put heavy apps on "Sleep Mode".
Hey, make sure your sim card pins are fine, did you fall down your device ? if there is not any hardware issue, then you can fix this issue simply by flashing your device with firmware. You should complete detail of your device to answer you more descriptively.