sighup on file editor?

hello

I was editing a file twice today, using nano... and it suddenly got SIGHUP after I didn't work on it for a few seconds...
may it be a memory problem (memory full, so kill some process)?

I knew it worked like that on Linux, but it's FreeBSD... and there's a lot more of SWAP:

Mem: 639M Active, 168M Inact, 162M Wired, 30M Cache, 111M Buf, 1660K Free
Swap: 2048M Total, 148M Used, 1900M Free, 7% Inuse, 4K In

any ideas?

 

 

 

 

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