Losing tons of hair but not the weight!
Sorry, always difficult to answer without knowing the details.
Can't see how it could be the band at four years post-op.
Why do you think your weight didn't come off?
Highest 290, Banded - 248 Lowest 139 (too thin!). Comfort zone 155-165.
Happily banded since May 2006. Regain of 28lbs 2013-14. ALL GONE!
But some has returned! Up to 175, argh! Off we go again,