Anyone that is a Lawful Permanent Resident (LPR) and is outside of the U.S. for 180 days or more within any 12 month period (not necessarily calendar year) creates a rebuttable presumption of abandonment of residency. That presumption can be rebutted by evidence to the contrary such as filing U.S. taxes, maintaining a home in the U.S. and paying that mortgage or rent, maintaining a U.S. drivers license, U.S. bank accounts with significant movement, etc.
Someone that has been outside of the U.S. for more than 1 year without first having an approved re-entry permit has abandoned their residency and only in very few exceptions (such as serious illness) can they get it back.
Here is an official link:
So yes, it is possible that they believe that you abandoned your Residency status. They recently changed the N-400 to ask about the last 5 years and no farther back because I think they didn't want to deal anymore with abandonment of Residency issues because that would require them to send the case to an Immigration Judge which costs the government money.
What you have to hope for is that they are just going through the motions because the law requires it, but because you own a house in the U.S. and paid your U.S. taxes, etc. You should have enough so that they don't want to forward your case to immigration court. You can also withdraw your case and file a new N-400 when more than 5 years have passed since your last long trip, but I don't think that is necessary. Just provide the evidence of everything that you had in the U.S. during your time away.
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