Lagged Multimedia

[ocherfas]

hello,
every few seconds the multimedia gets lagged for a second or so. it happens in flash, and also when playing music that is stored on my computer.
also, i checked the system monitor and i'v noticed that every time it happens one of my cpus peaks.
system:
linuxmint maya 13
-processor: quad core cpu intel i5-2500k
-8GB ram
-graphics card: Geforce GTX560 Ti


any ideas why this happens?

thanks in advance.

[ocherfas]

i ment that it gets lagged every few minutes.