Update Luma.
Luma 8.0 forced that annoying Arm11 Exception Handler, which made every little error crash the system and since almost no app was updated for use with Luma 8.0, many problems occured. Luma 8.1 or atleast the Hourlies let you turn off the Handler in Luma Configuration Menu (Press Select while booting).
https://github.com/AuroraWright/Luma3DS/releases/tag/v8.1 Grab this, replace your current boot.firm with the new one and you are good to go.