No, I don't know why there would have been an increase. In my experience, the ability for clients to get direct information from IRCC, formerly CIC, has not changed dramatically in the past 10 years. I would have seen going to an MP as a last resort 10 years ago, and I would still see that to be the case. I have no answer as to why there would be an increase.
Evidence of meeting #45 for Citizenship and Immigration in the 42nd Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was ircc.
A recording is available from Parliament.