Hard to record video with poor phone reception

Hi there,

In my gym there is close to zero phone signal, and it makes recording video very difficult for some reason. Sometimes I record and when I check the video hasn't been recorded. Other times there's a long delay before it plays. One more thing that occurs is that it seems that when I play a video in this low signal area there is a long delay before it plays (and an icon that looks as though it's loading).

There's 3.5 G of room on the phone, so lots of space.

Thanks - Nigel