Those "Beeper" codes are signs of trouble. Most systems give one short beep when it successfully POSTS will all things in the green. There should have been a small portion of your MoBo User's Guide that should cover those beep codes and what they mean.
It concerns me that your system is doin it more and more often, that is a sign that what ever is wrong is getting well...more wrong. Something may be dying. I suggest you STOP using your system now and start your troubleshoot.
#1Get the manual out and read thru, lookin for the beep codes. They will most likely be listed in the POST/BIOS section of the manual.
#2 Start righting down your observations of the beep events. Log when they happen and what you were doing. Log, what program you were using, the time of day,the day of week everythin you can think of to look for a pattern.
3#Start testing your parts. One at a time til you find a bad part or parts.
This may be a pain if you dont have another "working" PC to test your parts in, I suggest do what I have been doing, collect old systems just for trouble shoot abilities. I have boards that take PC100 RAM and boards that take stuff like Rambus600, it's nice to be able to test a wide range of components.
4#If you get stumped come back here and be thorough in your description of your issue. You can NEVER give too much detail.