UR28M Phantom Power Fault

I’ve just recently received my new UR28M…
I’m currently using the "Little Labs Redeye 3D Phantom DI/Re-amp box… Since this unit has two inputs, one for instruments with active pickups and one for instruments with passive pickups… The input design for passive pickups, requires phantom power… so I hit it in my UR28M. After that, I realized that the signal was extremely weak… There’s a led on the DI that’s suppossed to lit when phantom power is engaged, so, just when I hit the +48V button, the led turns on and inmediately starts decaying. Has anyone experienced something like this?