.nettiers array index out of bound problem.

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Last year i have a requirement to deliver a project within very short time. At that time i was studied .net tiers. It will help me a lot to deliver this project intime within the budget.

But when i publish my project most probably after 2-3 days client reported me that after 6-7 hrs each page show an eror message like "array index out of bound". Client also added me that when this error occured he restart the IIS & problem resolved but again & again thoriugh this error with 6-7 hrs gap interval. I tried a lot to find out this problem. Since after restarting IIS this problem resolved that means i guess something related to memory leakage problem. Then i started to find this problem in different angel & i found data layers few method generate this error. Methods are:

1)find();

2)getall();

3)getbyid();

Then within very short time what can i do. I just replace above methods by my own developed function & system starts running smoothly.