Point Light Freezing in Android

Hello everyone, I'm currently working on mobile racing game. I have a brake lighting system. Here my script:

for(int i =0; i < brakeLights.Length; i++){
if(!reversing)
brakeLights.intensity = brakeLightInput*4;
else
brakeLights.intensity =0f;
}​

On PC, it's working perfectly. But on my mobile phone if I braking first time in a scene, when I braking, game freezing about 2 seconds. After that I'm braking repeatedly but game not freezing.