The problem is that sometimes the system crashes after starting up the system. It seems to me that it's connected to the network usage, because the crash usually occurs after starting a software which uses the network heavily. Starting Firefox with lots of open tabs or starting Transmission or even the update manager seems to trigger the crash. So after a few seconds of opening one of the mentioned programs, the system just crashes and the PC restarts.
There are cases when the wired network connection's status is not connected, although the cable is connected as usual. Most of the times the crash can be predicted based on this.
Once the system starts normally (and not crashes after opening Firefox) it remains stable in all of the cases. Sometimes it takes 3-4 crashes to reach this point. Sometimes the first start is already good.
I checked the syslog a few times after these crashes, and the last line before the crash is always something like this:
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May 20 07:42:01 linux-mint kernel: [ 115.747227] [UFW BLOCK] IN=enp4s0 OUT= MAC=**:**:**:**:**:**:**:**:**:**:**:**:**:** SRC=192.168.*.1 DST=192.168.*.2 LEN=300 TOS=0x00 PREC=0x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
I use Linux Mint 18.3 x64, Cinnamon, 4.13.0-41-generic x86_64 Kernel, an Intel Core2 Duo E8500 CPU, a Gigabyte GA-P35C-DS3R-rev-1x motherboard.
I already updated from 18.1 to 18.3, the Kernel version, the drivers, the problem is the same since a few months. Can't think of any package install or update which triggered the problem the first time.
What should I check in this situation? Is it even possible that it's connected to the network usage?
I appreciate any help,