Questions on CC bec

[speed demon]

I'm running on 6S with one servo and 1 30mm fan and 1 40mm fan. The cc bec is setup at 5.1v and it decided to just stop working and just makes a slight buzzing noise and get hots fast. What could caused this? Is 6S and the fans too much? I plan to buy a new one unless there is a better one out there. If I get another one would going up to 6v help? Would that help so it doesn't have to knock down so much volts?