I did an additional test to determine if psmouse's lost synchronization
errors were the cause of the random freezes.
I blacklisted the psmouse kernel module at /etc/modprobe.d/ and
eventually my laptop froze until I pressed a key. Unfortunately, there
were not any error messages either on dmesg or /var/log/messages.
So the problem does not reside on psmouse kernel module. I think that
some people complaining about these errors all over the Internet may be
facing the same problem than me but masked by the psmouse's lost sync
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