Hi thanks for your help, please check at the attachment
** Attachment added: "PREVBOOT.TXT"
https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.13/+bug/1960742/+attachment/5560876/+files/prevboot.txt
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Bugs, which is
Public bug reported:
before it crashes, 3 LEDs (Power, mayus,block number) turn on and turn
off about 3 times.. And all will be freeze it needs to shutdown keeping
pressed the I/O button
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu