Note that you have to first connect the development board and then start the PIC bootleader plus software and not vice-versa. If you still have the same problem, your software may be restarted. If still have the problems. check RX TX tracks connecting to the Microcontroller, or dry solder joints. Is still it continues the bootloader in the chip may be corrupted.
When you say you have "bought" the development board, it very simple to just dial NSK, contact Mr Kiran who will solve your problem and clear your doubts.