I have a back sports bra that has thin crisscross straps on the back. I was wearing it in the sun the other day and when I took it off, there were huge black marks on my back and the straps were hard and sticky. It seems like the sun literally melted it. Does this seem like something that would qualify for an exchange? I have had the bra for awhile and only wash on cold and don’t put it in the dryer. So this was the first time it was really exposed to a lot of heat.