Currently you cannot determine if it's your wireless router's fault, your broadband modem's fault, or your internet connection's fault.
I would suggest the following to scaledown towards rectifying where the fault lies..
Finding if its Wireless Router's fault1) Disconnect the wiring cables between your computer and the wireless router
2) Reconnect the cable from your computer to the modem directly
3) Connect to the internet using the software provided by your ISP or manually
This method bypasses the connection to your wireless router. It connects directly to your modem and to the internet, making sure you are the only user in the connection.
If the internet connection still fails, the fault could lie with the modem or your telephone line or cable line.
If it's working perfectly already, then the problem lies with your wireless router. The settings on the wireless router could have been badly configured, or it's physically damaged. Make sure its properly configured, otherwise get a new wireless router.
Finding if its broadband modem's fault1) Disconnect all wiring cables from your computer to wireless router and modem
2) Enquire your ISP or a friend for a loan of a broadband modem (cable/ADSL according to your subscription) to test the network
3) Reconnect the cable from your computer directly to the loaned broadband modem
4) Follow according to the settings of the loan broadband modem if required
5) Connect to the internet using the software provided by your ISP or manually
This method is using a another modem to connect to the internet.
If the problem persisted, it could have been your cable/telephone line problem. You would have to call up your ISP then.
If it's working perfectly, the fault lies with your broadband modem. Get a new broadband modem. Remember the type modem (calbe/ADSL) you will be getting, and return the loaned modem
Other Alternativesa) You may have to check if the cable's are working fine, make sure they are not twisted or placed near any power sources or power cables

Check if there is a problem with your network adapter for hardware damages. Ethernet card should be checked if it's a wired connection, wireless adapter should be checed if it's a wireless connection.
My SuggestionsI had my wireless router starting to drop packets and frequently getting ping timeouts. After afew researching and experimenting, I realised that it's due to the long hours of usage to both the wireless router and the wireless adapter. These wireless devices cannot and will function abnormally when the presence of heat is high. I would recommend that you turn off your wireless router for every 6 hours of usage. Even though it still works after 6 hours, it problem might come sooner or later. That's a way to protect and maintain my wireless router and adapter..
Get on going...!
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