Macbook Pro retina have a network problem that I need to restart my computer before getting it's able to connect to internet

Question

Macbook Pro Retina 15" 2012, Mountain Lion OS pre-installed.
Case 1:
It connects to WiFi home network and internet fine.
Put the machine to sleep.
Upon waking up, it can scan for my home network that it used to connect to, but either not able to connect, or even after it connects, it just can't let me access internet.
Restarting the machine can revive by getting it connects properly to internet.
Toggling the Bluetooth won't help here.
Case 2:
It connects to network using USB ethernet adapter.
Same case, everything works fine before sleep. After sleeping for some time, it's not able to connect to the internet any more unless I do a restart.
It's able to access local area network though, as I'm able to see some local network machines in my Finder window. Yes, I clicked on them and able to connect to their share folders. But just can't get through internet.
OS Problem? I'm not able to roll back to other OS, I swear I don't want to go through that painful process.
Hardware problem : WiFi card? Don't think so, because I can't get to internet even I immediately switch to USB ethernet adapter.
Hardware problem : USB ethernet? It works fine in other non-Mac machines.
There got to be something wrong in somewhere that it doesn't re-establish the connection to the internet, no matter what I do.
None of the functions in the network utility tool can help.

Answer 1

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device. 
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click  Log in.
*Note: If FileVault is enabled under OS X 10.7 or later, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.