Hi zbs888
... At present, the frequency of BIND and CROND service freezes is about 30-40 minutes, ...
/var/log/kernel.log
Apr 25 15:31:23 localhost kernel: mce: CPU3: Core temperature above threshold, cpu clock throttled (total events = 3167)
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Apr 25 16:01:28 localhost kernel: mce: CPU2: Core temperature above threshold, cpu clock throttled (total events = 262)
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The system overheating events are 30 minutes apart. I'd call that a pretty good clue.
... lasting 4-5 minutes each time. However, this frequency does not match the mce information in the kernel file, which is really confusing. ...
If the system is overheating and malfunctioning, I wouldn't necessarily expect all of the logs to make sense.
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Apr 25 16:26:05 localhost kernel: floppy0: no floppy controllers found
Apr 25 16:33:43 localhost kernel: floppy0: no floppy controllers found
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What's going on here? Your dmesg says there is no floppy controller.
Hit Ctrl-Alt-F1 to switch to the console and see if any mce errors are
being reported there. Hit Ctrl-Alt-F2 to switch back to the GUI.