How often does Service Canada reassess CPP disability cases?

Does anyone had their CPP disability case reassessed and asked to provide current medical information? How often do they reassess cases?

I don’t think it is common but maybe it is becoming more common as the government tries to make everything harder.
http://www12.edsc.gc.ca/sgpe-pmps/servlet/sgpp-pmps-pub?lang=eng&curjsp=p.5bd.2t.1.3ls@-eng.jsp&curactn=dwnld&pid=5902&did=1&_ga=2.257603979.1231695712.1493914015-632825053.1493411006

If you are receiving Canada Pension Plan disability benefits, Service Canada may at some
point reassess whether you are still eligible to receive them

Great resource! Thank you Jammer!

I am thinking of moving to another county so I have a lot of concerns of whether I will be able to keep my benefits or not.