Don't know if you've updated to 10.8.4 yet (released 4 June) but improved wifi is among the various 'fixes'. Maybe worth updating to see if it brings any improvement.
If updating the OS doesn't help, here's a list of suggestions to try that have helped some users although, unfortunately, not everybody. In no particular order:
- Check wifi security - if it's WEP change it to WPA or WPA2 (preferably, as it's more secure)
- Change the wifi channel on the router
- Create a new Network Location: http://support.apple.com/kb/HT5289
- Reboot the router
Also take a look at this link and the links within the article for other ideas. They mainly reference Lion, but still seem to be relevant to Mountain Lion:
...and this link:
Thx Paul- I upgraded- BUT now something new is happening. The internet went dead today, I called my PC minded servers and they say I pulled too many IP's, which is something unheard of, unless I have a virus and since I mac I don't. They reset-- 2 hours later, too many IP's again-- reset- New tech says now the router is doing the pulling, it sent the ip address thousands of times-- wanted to know if I programed it-- Nope his dudes did.
So any ideas on knowing if my fairly new airport extreme that has been updated recently is the problem or their getting their pc hands on it is the problem?
Yeah I was and am on the same internet/router/computer that is/was pulling too many IP's. I don't think it is me.
Seems to be working now. The previous server used this same router etc. never had this issue. something is off with their equipment I think, hope. All my updates are in on the extreme, I opted for it just a few months ago, my theory is if EVERYTHING is Apple then it should quit gliching-- Just cant find a provider that knows anything about Apple round here-- West Texas is great, but no Mac-ies