Server Crashes!

Hello,
I have got an AMD Barton 3k+ with 1 GB of RAM, it has been crashing a lot lately, and I have contacted the support department, and they have told me that I am in immidiate need to ram, but from WHM it never shows me that the server is useing more than 40% of the ram, while in SSH it shows me that there is only 30 or less MB left (using 'free -m'). Could someone tell me which of both is more realistic? what could I do until I get to upgrade the ram to avoid the crashes?

Thanks in advance Server Crashes!

 

 

 

 

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