mobile

Hi,
I received this replacement T-Mobile Galaxy Note 4 from Asurion yesterday and it is happening that T-Mobile network signals are dropping randomly and most of the time. I did not had this problem with my earlier note 4 which unfortunately I lost. I am not sure if this is hardware problem or some app is causing trouble although all the apps are same which were installed on my last note 4. Should I return this hand set and ask for replacement or there is some solution for this problem?

Thanks