The kernel log indicates that hardware errors were detected.
System log may have more information.
The last 20 mcelog lines of system log are:
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Jan  5 10:32:09 hafza mcelog: mcelog: warning: 16 bytes ignored in each record
Jan  5 10:32:09 hafza mcelog: mcelog: consider an update
Jan  5 10:32:09 hafza mcelog: Hardware event. This is not a software error.
Jan  5 10:32:09 hafza mcelog: MCE 0
Jan  5 10:32:09 hafza mcelog: CPU 1 THERMAL EVENT TSC 7722fe2d8c7
Jan  5 10:32:09 hafza mcelog: TIME 1483608727 Thu Jan  5 10:32:07 2017
Jan  5 10:32:09 hafza mcelog: Processor 1 below trip temperature. Throttling disabled
Jan  5 10:32:09 hafza mcelog: STATUS 88020a8a MCGSTATUS 0
Jan  5 10:32:09 hafza mcelog: MCGCAP c0a APICID 2 SOCKETID 0
Jan  5 10:32:09 hafza mcelog: CPUID Vendor Intel Family 6 Model 70
Jan  5 10:32:09 hafza mcelog: Hardware event. This is not a software error.
Jan  5 10:32:09 hafza mcelog: MCE 1
Jan  5 10:32:09 hafza mcelog: CPU 5 THERMAL EVENT TSC 7722fe316ed
Jan  5 10:32:09 hafza mcelog: TIME 1483608727 Thu Jan  5 10:32:07 2017
Jan  5 10:32:09 hafza mcelog: Processor 5 below trip temperature. Throttling disabled
Jan  5 10:32:09 hafza mcelog: STATUS 88020a8a MCGSTATUS 0
Jan  5 10:32:09 hafza mcelog: MCGCAP c0a APICID 3 SOCKETID 0
Jan  5 10:32:09 hafza mcelog: CPUID Vendor Intel Family 6 Model 70
Jan  5 10:32:09 hafza mcelog: mcelog: warning: 16 bytes ignored in each record
Jan  5 10:32:09 hafza mcelog: mcelog: consider an update