Boot Animation Will Not Loop
Create an animation script (text) file as desc.txt with the following content:  

240 320 24  
p 1 0 part0


Explanation:


In first line 240 320 24, 240 320 is the device's resolution and 24 is the frames per second. Higher the number, faster the animation.
In second line p 1 0 part0, p is a code to tell it to look at new commands, 1 is the number of times the boot animation will play (0 means infinite), 0 is a code to tell it to pause. 0 means no pause, 10 means pause for 10 seconds - repeating or moving on to next line.
part0 is the foler in which your animation images are contained.


Could you please check whether fourth parameter is 0? If not set it to 0 for infinite loop.