Does travelling in and out of Canada frequently make a citizenship physical presence audit more likely?

It can. Frequent international travel, particularly patterns that are difficult to reconcile cleanly with the days of physical presence declared on a citizenship application, is one of the factors that can prompt IRCC to take a closer look at the calculation and request supporting documentation before proceeding. This is not because frequent travel is itself a problem, but because it naturally creates more opportunities for a declared calendar and independent records to appear inconsistent.

Frequent travellers, such as people whose work or family circumstances involve regular trips abroad, are not doing anything wrong by travelling often, but they do carry a practical burden of keeping more careful, accurate records than someone with a simpler, more static travel history, since any inconsistency is more likely to surface and need explaining.

Anyone who travels frequently and is working toward the citizenship physical presence requirement should keep detailed, contemporaneous records of every trip, including dates and purposes, so that if a closer review does happen, clear documentation is already on hand rather than needing to be reconstructed after the fact.