hyperion 1210i owners!

I have just a quick question about the hyperion 1210i charger. Every time i use it when its charging my batteries (4s 5000mah lipo) it will charge at 5 amps for a little bit and then go down to 0 amps and the fan turns off and then it powers back up and goes back to 5 amps and the fan turns on. it does it every time i charge.

I was just wondering why it did it or should it not be doing that and there is something wrong with my charger.


thanks!