High Memory Usage

As of recently, my server has been going down more and more lately... sometimes multiple times in a day. I've been watching top and it appears that more and more memory is now being used.

CPU states: 1.9% user 1.3% system 0.0% nice 0.0% iowait 96.6% idle
Mem: 1000988k av, 629256k used, 371732k free, 0k shrd, 17428k buff
81008k active, 512652k inactive
Swap: 2024180k av, 0k used, 2024180k free 438144k cached

Any idea why this could be happening? I only have a small Forum on my server and a medium sized site.

 

 

 

 

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