TL-WA5210G Access point problem

Hi all,
I am not very expert, so i will talk in normal language, please try to understand my problem and give me any solution, if you have any. I am using Tp-Link WA5210G as a wireless router and have connected it with the wireless modem provided by my ISP. The problem i'm facing from almost a month is that, when i turn my router on, it does not start immediately and obviously does not provide me wifi signals but eventually turns on sometimes after half an hour and some times does not even turn on even after many hours. But when it turns on, it remains turned on until i turn it off myself. Another thing, which may help you in solving my problem is that router has 3 types of lights on it, Power light, LAN light aur Wireless Signal Strength "set of lights". When i turn my router on, Power light turns on immediately but other lights don't and when after some times my router starts working, all lights turn on. I have checked all cables and connectors etc. they are working fine.
Can anyone give me an instant solution? :(