I had just bought my second remote for my wii & i had sync as per instructions to be controller no2 and lights indicator is on too

in the wii menu it works fine and i can c the little hand on the screen , but the problem is that the controller is being disconnected as soon as i turn on any games or even entering neogamma screen

i read some blogs of unplugging wii and reset sync and re-sync again but the same problem happened to me again , the 1st controller works fine and always on

what is the reason of such an issue ? and how can i solve it ?