[Q ] Samsung Galaxy Grand i9082 Network and Misbehaving complain

Hello Xda . Im having Samsung galaxy grand i9082 and when I try to upgrade the phone to Lollipop 5.1 , the tutorial I used it required root access to flash the Custom rom , I try to root the phone and successfully rooted, from that time I kept my phone, I dont know wether its rooting touch my network problem, my network is showing like small redball inside network bar and the phone is showing black blank page and turn back, just like you open and close tv at the same time :( pls XDA help check this problem for me , :crying: :confused:
This is the video link of my Samsung galaxy grand i9082 problem
datafilehost .com/d/a4661b72

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