need service get it?
the channel tracks are bad or broken or dirty.
clean out?
that is never strange, broken or thermally.
I hate sun roofs most are made with cheesy weak cheap plastic parts. that LOVE TO FAIL. my Jeep is a convertible; vastly better
google sun roof fails, and cry. (vast did)
and always fails (stuck open) when it rains, (murphy;s law)
sure in physics 101 google how materials expand hot.
icing too.fails (packed in ice)
even the car body can expand hot,and does.
google material thermodynamic expansion and contraction.
https://en.wikipedia.org/wiki/Thermal_expansion
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