my system linux system crashes often
 

on my netbook xubuntu 32bit an aspire one 110l often crash at about 90% system load and temp are quite good max 62 C° (acerhdf) 47C° (Core=) where can I find why it crashes since some days? Linux hp 3.13.0-44-generic #73-Ubuntu SM

did you try to clean it? http://yesmobiletech.com/news/repair...-keep-it-cool/

i forgot to say that the operating system is on usb mechanical hdd and crashes when the writing light on ssd (which has has the swap partition)is on.

You might try memtest86 on the machine. Having bad RAM or running out of it is one thing that will crash your system, regardless of the operating system. And running the system too hot is another. If you're running an older distro, you might try a newer one, but more applicable if the hardware was new-ish. And patch your system if you use 3rd party things like flash. Yet another zero day patch from adobe, there's been at least five that I've been aware of and patched just this year and it's only mid-march.

If you suspect the swap, you might try a fresh install on another usb storage option and see if the issue persists. Drives and flash cards don't last forever. At a minimum you could have a 2nd device, say a card reader and SDHC card, for just swap and see if the problem goes away or is less severe. If the usb drive is usb powered you might try a powered usb hub as laptop usb ports tend to be underpowered.

Do NOT put a swap partition on a SSD - unless it never gets used.

Avoid all unnecessary writes to SSD, unless you want to shorten its lifetime.

there was no problems with dust or so in the fan zone, all clean. but the system stopped freezing after a system update by now.