I have plenty of power (5V 60Amps) but out of 6 strips (5Meter 150LEDs each), three of them do not light up all the way to the end...the very last 3 to 5 LEDs do not function. When I connect another strip to these strips, they also fail to function, even when I add another 5V30Amps to the connections. Controller has 3 channels and each is set to control 300 lamps. Should I just cut away the parts that do not function? Or is this an indication of another problem?