ipt_unclean... server crash?

My server crashed yesterday and I asked the technicians to get an error message before the reboot. This is was they had:

"ipt_unclean: UDP len too short 10 vs 18" (12 times)

What can I do to fix or prevent this? Everytime the memory used reaches around 90%, the server loads rises up to 4 or 5 and the server crashes...

 

 

 

 

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