Hi, everyone!

I have a dell inspiron 5720-9235,(i5-3210M processor, 6gb memory, 1TB hd, 1gb Nvidia graph.) pre-installed with windows 8, 64bit, intel centrino wireless card N2230.

I have the following problem : my pc loses internet connection completely, 2-3 times a day (it depends how long i use my laptop) and i have to re-connect to my network manually. When this happens an exclamation mark appears where the icon of signal strength is set. There is no problem with my internet connection or router because i've tried several times to connect to the internet with my cell phone when this problem happened and there wasn't a problem. I contact dell support team (Greece) and they adviced me to update bios and wireless card driver. I did so but the problem insists. If someone has any idea, please let me know.

Thank you in advance, Stelios.