Seaboard Block degrading

Hello, so the soft surface of my Block is ungluing from the base a bit, in lower left corner.

I’ve always played it carefully, and it was stored in linnstrument’s soft case most of the time sinse I’ve bought linnstrument around a year ago.

I wonder if anyone here had similar experience and if there’s an easy fix to this issue. I kinda want to let go of it, but I can’t sell it like this. Thanks!