There is some confusion here. Luca please correct me if I am wrong ...
1. You were originally running Natty and that was working fine for you.
2. You installed Precise and started to experience the issue.
3. You installed the Natty kernel on your Precise system and that is also
showing the same problem.
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https://bugs.launchpad.net/bugs/997767
Title:
10ec:8139 Network connection rtl8139 lost after some hours of
inactivity and comes up again on user interaction
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