what would cause a 50% loss on a ping?

ive been having intermittent issues with images loading and yesterday the server locked up and did a core dump. today im noticing that connectivity is hit or miss. I tested all the dns servers, which are outsourced through mydomain and they all reply in sufficient time, all with 100%.

then i pinged a few of my domains and they all return 50% connectivity. what could be causing this, any idea?

 

 

 

 

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