+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
NEXUS lane can flag you to go to secondary if anything seems amiss. It can detect that your last exit from Canada was a year ago and that could be enough to flag you to talk to someone.
My last exit was in December 2017 and I am planning to visit Canada for a weekend every 2 months or so as I am close to border.