iPhone 7 running iOS 10.1.1. While at work my phone is connected to my company's wifi and I have no issues with sending or receiving iMessages. When I leave the building and my phone switches over to LTE I am no longer able to send or receive iMessages unless I restart my phone. This happened all the time on my previous phone (iPhone 5s) as well, so I'm thinking it has something to do with my company's wifi? Any ideas on what could be causing this or how to fix it other than restarting the phone?