Maintaining a good Bluetooth 4.0 connection between the RFLKT+ and your phone is critical to keeping the data flowing properly. The biggest problem with connection issues is that the human body is primarily water and water is a perfect insulator to 2.4GHz radio traffic.
If your phone is flat against your back in a center jersey pocket it is very difficult for the signals to make it to the RFLKT+. If you place your phone in a side pocket with some space between your phone and skin the signals can find their way to the RFLKT+ much more reliably. Unless the phone is in direct line of sight with the RFLKT+, the signals will have to bounce off surrounding objects like the ground or nearby trees.
As a last resort, placing your phone under the saddle in a saddle bag will provide a line of sight to the RFLKT+ and subsequently a much much better connection.