This is pretty common w/ BofA. At some point it happened to both Cheddar and me.
I think it's just their way to 'remind' you that you can spend with the card, lol.
Actually, I called when I got the email because I was like "say wha??" -- and they just told me, "Yup, you're now at 5k -- still."
~*~*~*~*~*~*~*~*~*~*~
From 700 in 2008 to 498 in 2012...
4/23/12 -- BK 13 date of filing EQ = 505
4/18/12 -- EQ 498
12/5/13 -- EQ 669
Here we go.... back on track.