I have had my Note 4 for 5 months and for the last 2 months I can't hold a signal in my own house. 9 times out of 10 when I look at my phone my signal is 1 bar of 1x. Even when I'm out and I have 2 or 3 bars of 4Glte I drop calls like crazy. I have gone to a Store and they replaced my SIM card and no change. I have factory reset it and everything but to no avail.