Razer Phone 2 Poor Signal and Signal Loss

I recently purchased the Razer Phone 2. Let me tell you, this phone is amazing. However I noticed a problem that somewhat bugs me. I had an iPhone before and I always got a constant strong signal wherever I went. Even inside buildings. When I put my SIM card into my Razer Phone 2, everything was good. It wasn't until when I entered a building that I noticed my signal dropped constantly. I constantly had to turn on and off airplane mode and it would still lose signal. It would keep a signal for up to 2 minutes max. This is the same building that I was in when I had my iPhone and it got 4-5bars and never lost signal while the Razer phone could only receive 1-2 bars. Even at home I get 2 bars while I used to get 5 bars on my iPhone. Outside is the only exception where I would get 4 bars though I have never experienced 5 bars before. So I question, why is my signal so bad on the Razer Phone? I go into th same building I did with my iPhone but get poorer siganals and sometimes none at all. Does anyone else have this problem and is there anyway to fix it? Yes the phone was unlocked and I use Verizon.