For LTE, go to setting > mobile data > network selector and set ur network provider manually, it will help a bit

For Wi-Fi, go to setting > mobile data and scroll all the way down and u will see “Wi-Fi assist”, turn it off

My 4G and Wi-Fi is Very stable now after follow the setting above, try it out yourself

This post has been edited by heidarren: Nov 19 2018, 08:20 PM