lets not forget how heavy and complex ISS is. plus its getting old. things like the stress of so many obits cycling its temperature.......with so many modules , never before has anything that large and complex been in orbit

hey o ring erosion isnt hazardous. its never caused a real problem..............

hey foam loss isnt hazardous its just a maintence issue.

and ISS is in a ever increasing debris field. space junk is probably one of its biggest enemies........