I may be totally wrong but just thinking loud :
Because there's a mass trigger of such "update" related messages I guess CIC is updating some process or process steps at backend. A reliable source told me that they are constantly receiving feedback on anomalies and updating their process which is a good thing. And I can imagine that either through a workflow or a batch job all live applicants/profiles are being sent such message even though you guys might not have made any change, neither has there been a change in your profile. So, you can either call CIC to clarify or if there's no change in your profile neither has your score changed may be just chill out.