Thanks, Sergio. I appreciate the advice.
I never actually consulted a "qualified immigration lawyer" when applying for either temporay or permanent residnecy.
My Argentine girlfriend insisted that I use her attorney (who knew almost notning about immigration) to apply for temporary residency in 2006. After I realized they were in cahoots to get me to buy an apartment and put it in her name, I dumped both of them and applied for the temporary residnecy with the help of the "clipboard lady" who I met on the sidewalk, directly in front of my soon to be ex-girlfriend's office after returning from a meeting with her attorney.
If I ever have any doubts about my DNI, I will simply check with the office of the Registro in Punta Alta. They issued the nueva tarjeta in 2014.
I haven't had to deal with the DNM since 2009 (which is the year I was actually granted permanent residency, not 2012 as I wrote yesterday).
I don't think I will ever fail to be present in Argentina for two years or more and, as a result, lose my permanent residency. In fact, I seriously doubt I will ever leave the country again