Altera cyclone v FPGA issue

LED blinking is stopped now, after connecting to a new external power source. But the rest two problem remains. In my developed system, i am setting some default setup for the leds through KEY button for data acquistion from another board. That was working fine. But now that default set up of LED position is not remaining stable, after setting it should capture data, but that default setting is changing automatically, so i am not able to collect data. Also, when FPGA board is connected to data acquisition board, current fluctuation is occurring in power supply that is connected with data acquisition board. please suggest on this.