Did you submit a citizenship application and received a residence questionnaire to complete? Recently, Citizenship and Immigration Canada has been requesting applicants to complete this questionnaire to ensure that the residency requirements have meet met. Applicants will most likely also be required to obtain health records as we as entry/exit records.
It is important to submit a properly completed questionnaire as well as supporting documentation depending on the number of days you have spent in Canada for the required residency period.
You should consult with an immigration lawyer to discuss the particular facts of your case and determine the best strategy for you.