I got my gc2b tri-top on may and last week I noticed it was "worn-out" on the back. At the moment it was very small patch and I thought I hadn't been careful enough while washing it. But today I took it off and the "patch" was huge

this is obviously a ploblem because, whatever this is, it makes the fabric unsteachable, if this goes on to every part of the binder (wich will probably happen someday soon) it will make it useless.


I wear my binder all day, everyday and I hand wash it once per week, I also hand it to dry (always in shade, only a few times I've left it on the sun but never for more than a few hours).
I once had a swimming top of the same fabric and it got worn out like this because I always hanged it on the sun to dry, but that shirt lasted for months! this binder was new just three months ago. I think one of the main reasons is I wear it a lot and it's my only binder and also I sweat a lot on this weather... I am thinking on buying another two by january, but I'd like to keep this one, maybe fixing it or recycling part of it.
Does anyone has any tips for fixing this?
I'd specially want to know how to
prevent this kind of stuff, since I plan to buy more (I mean, this is a very good binder, this problem looks preventable, not the manufacturers fault).