Wi-Fi connection keeps dropping on my sony xperia c?

I bouts this phone yesterday and since then i'm encountering this problem. My Wi-Fi is ok and i know that as it runs very fast on my pc and iphone 5. Sony xperia c has got a decent Wi-Fi still it take long time to open up pages. I would give you an example. Like when i download an app from the play store it would take around 2 min. To start up downloading and then the Wi-Fi would act very fast and download it quickly. Same if i open up web pages for the first time it would take a long time but then it would open up other pages quickly.others who got the same or similar problem please help.

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