Woofer distorts on strong bass

I had a JBL Flip 6 a month ago. Normally, I used to dunk it in water, and it sounded normal before. However, yesterday it was underwater for too long while some high volumes were playing. I picked it up, and it sounded normal at first. After drying, I noticed the woofer sounded very different. It does not affect the mids and the highs, but only the bass. It faded very slowly, but the bass sounded awful. Any JBL users who dunked their speaker underwater for too long with high volume or bass?

Do I need to replace the woofer or the water softens the woofers cone? It's after warranty. This JBL model is TL if you may want to know.