Strange freeze on -STABLE

[Deniss Lee]

>Check your computer RAM with memtest86+ and change NIC.

I already replaced one xl0 card which was IMO unstable. And now
I have 2 network cards (it's a rouer) and one internal. So do I have
to replace both cards? And what if internal network card is buggy?
I'm screwed?

Good idea about "memtest86+", thanks, will try.

> If its always when the box is quiet / no one using it, is
> it something to do with power saving settings?

Do you mean settings in BIOS? Nothing has changed. Or is there
any other settings in FreeBSD itself?