Sagging liner normal?

_genepool_

New member
Jul 28, 2020
1
Detroit, Mi
This has been a hot year here. I have had my pool for 4 years and this year the liner is sagging at the top. It is not out of the track anywhere but has a lot of sagging and it has never been like this before. Should I worry? Is this something that can be remedied? Or should I just leave it be?