As I have posted here many times I have gone over the top of my new bike several times. I did this months after I purchased it. My front disc was making some noise the other day so I took it in. I told the shop about my wrecks. At first they were telling me that it was most likely my abilities. I argued that it may have something to do with the how the bike is setup. I had moved my seat back as far as I could because I felt like I was always going over the bars as I was riding. They told me I had the seat in a dangerous position and they moved it forward. Then someone in the back said to me, here is you problem your pressure in the front fork is to low. I was very surprised to find out it had dropped about 25% of where is should have been in just three months.
Moral of the story. When someone tells you that you only have to check your fork pressure once a year they are most likely wrong. I would recommend checking it monthly, but I am sure others have better suggestions from their own hard empirical data.