OnePlus India — having trouble with my oneplus phone

Address:	600049
Website:	oneplusstore.in

I have this wonderful phone oneplus 3 brought last year during the month of august 2016. After buying the phone i had the below problem and the same was sorted out by the customer care asking me to reset the factory setting and reinstall the new updated software. It was fine from then on and no issues...

"oneplus launcher isn't responding (Or) incallui isn't responding
Close app with an x mark
Wait with a clock sign"

But now once again i am facing the same above problem, but this time it is not the software, but it is with wifi & data usage. Whenever i switch on to wifi or go to data usage while on roaming, my memory gets overloaded and the system gets heated up and i have close my wifi or data connection and reboot the system in order to make it to work properly.

Now i am not able to understand why this problem has occurred and this problem was not there for the past 10 months and has cropped up all of a sudden in the last one & half month. I really feel dejected whenever i get this problem bcoz the system totally get slower and also accessing other apps in the system gets tougher. The touch screen also get stuck sometimes or goes for a toss by getting hanged or frozen for some seconds. Also when i get any phone calls or make any phone calls the contact doesn't open or the names doesn't gets displayed on the phone and to make this all ok i have to reboot the system always... I don't know what other problems are going to come up further… pls need a solution for this...