So, I work in an office building where I can connect to LTE, but the connection only lasts minutes. I then get downgraded to 3G or even 1x. If I put the phone in airplane mode...then take it out, I can reconnect to LTE, but again for only minutes before its 3G again. However, when I start a file download outside the building (while connected to LTE), and continue the download while I am in the building, I can maintain the LTE connection for hours (or at least the duration of the download). Any idea how to always keep the LTE connection inside the building? Thanks.