Besides these two back-to-backs, I have not heard of other micrometeorite damage to soyez coolant systems - I am sure others know more than me.

Given that this has been in the news, including testing of the empty descent, this seems novel, and not at all routine. So we are not looking at a sample size of 2, but of ALL Soyuz -- which have been in service for decades, no?

Good observation that the station should provide context on strikes (if not damage).