This just recently started happening. I've tried alot to fix it.
-Deleting my 000008f folder
-Switching boot.firm and boot.firm.back
I'm running a USA New 3ds XL, with Luma (latest Ver.), Gm9, and fastboot3ds <-- Which I am suspicious of.
Only Homebrew apps i've got are, HBL, SteelHax, JKSM...