"No Internet Access" periodically, Excellent Wi-Fi signal..

Hello,

I don't know where I should start my search for answers to my problem, so I'll start here, in hopes that it may be something with Windows..

I'm sitting right beside my ARRIS TG1672G wireless modem. I've tried connecting via ethernet cord, and it just would not work.. but regardless, I have 5 bars of signal (Excellent) over Wi-Fi, connected through WPA2-Personal.. this NEVER changes. I don't receive any lag when playing World of Warcraft, and if I do, it doesnt affect my gameplay at all. However, periodically, and I'd say its almost every 30 minutes now, I disconnect from WoW, and when I go to my desktop, my Wi-Fi signal says Excellent, but now my connection displays the message "No Internet Access". I've found the quick fix for this, opening CMD prompt, and typing ipconfig /renew, and although I get the message that basically ipconfig cant work "without the devices plugged in" (which I've assumed just means because I'm on wireless) immediately my connection switches to the "loading icon" then comes back to display my 5 bar signal, and now no longer displaying this message, and restoring my access to the internet.

Given this information, how periodically it is, how I fix it, and the fact that I have an excellent, steady signal, what could be causing these frequent disconnect, and my connection "losing internet access"?

Thank you so much ahead of time, I just can't figure this out, and its becoming a nuisance, as I'm in groups with others, and I disconnect

this is my ipconfig /all without the problem occurring

right now, I can't find any ethernet cords, so I would like to try to fix this wireless problem, because I'm sitting right beside the modem, and get Excellent signal, no interference.. just something is causing it to periodically go "No Internet Access, yet my signal is still connected, and Excellent (5 bars). I go into CMD, ipconfig /renew, and its fixed.. but this is only a quick fix, and annoying to do every 30 minutes when I'm booted from my game.

EDITED: by fixed, I mean once I type "ipconfig /renew", the "No Internet Access" message goes away from my connection status, and I can reconnect to my game.

EDIT2: Sorry if I confused you about connecting wired, that was awhile back. Ive given up. Now I just want to fix this problem with my wireless connection (I'm not trying to connect an ethernet at the moment, im using solely wireless connection)

thats weird.. I have no clue.

EDIT: Yes, it was provided by my ISP. okay, I will try that. Hopefully thats not it, and maybe somebody else will know the answer

doing a new ipconfig /all, now my "lease obtained" changed to today's date...

doesn't make sense.. is that all that you can conclude from my reports, that it just might be a defective modem?