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Antonio, I can not read your thoughts to work with so small description. If as you said system freezes (not crashes), then it provides not information about the problem. Please provide more information. In the provided debug I see you've experienced some timeouts of Realtek NIC. Are you sure what you see is a system hang, not a network problem? I would try to insert some Intel, if possible. If system indeed hangs, have you tried to enable debug kernel in case it detect anything wrong, providing some debug during crash.
System Freezes in a strong duty situation