There is less debris around on the way to mars and this is a known and worsening for the ISS due to its age.
A top (arguably, the top) metallurgist who studied previous failed parts told me it's corrosion of the Russian alloy used.
Corrosion is a hard problem in living quarters (ie moisture and salt) in space (sealed with no gravity)
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Debris from what? Satellite debris get in that orbit?
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