There are several possibilities...my gut instinct would be heat related. I have seen this in particular with AMD systems where the system board set the voltage too high when it auto-configured. This may not be the case here (you never mentioned any system data) but I would look in the BIOS and check your temperatures and voltage settings if it allows this. If not, double check on the motherboard. I see systems with these symptoms a lot as we reach June and July each year.
Hardware wise, I'dtake a look at the RAM and the power supply to make sure there isn't an issue with either. Being almost new, you'd think there wouldn't be....but....
If this is not the issue, the next thing I would look at is the freeze ups themselves. Does the machine return to a functional state after a "while"? If so, it could be network related issues. You'll need a packet sniffer to check this out. I've seen several instances where a device was "hung" while dealing with a network problem. Take a look at www.packet-level.com for some great information, tips and tools.
If none of this helps, please send some more details (system specs etc) and the old 4 out of five senses report (do you hear anything unusual: whining, chirping, grinding...see any changes: HD lights NIC lights, etc...smell anything: particularly burning...feel anything: Weak airflow, excessive heat on a drive, CPU etc.
Don't worry....I'm not going to ask you to taste anything. ;)
Good luck! Hope this helps...
