Tips for how to maintain a gas blowback pistol are all over this site, they should apply just as well to yours. In general, I'd lubricate it after any heavy use (ie a day of gaming, a few hours of shooting). Use silicone oil, after removing any oil leftover from the last time it was lubricated, apply it to any moving parts (slide rails, hammer, etc.) as well as any rubber seals. I'd learn how to dismantle your pistol even if you don't 'have' to, it's just good practice to know how it works.
Airsoft is where expensive things go to die.