Blue light constantly blinking, reset works until the box turns once

my litter-robot open air 3 blue light started constantly blinking about 1 week ago, I tried empty the draw, install the white bag following the Youtube instruction, disassembled the box and cleaned the surrounding and the clear glass in front of the DFI, now the blue light can be stopped blinking by pressing reset button once. And the light could be kept solid on until after the next turn. After the box cleaned the litter, the blue light blinks again, press Reset again will make it solid again.
So on and so forth.
In this situation, should the DFI be replaced? Or any other suggestions before I order the set please? Thanks in advance for your help.

This topic was transferred to internal RobotShop Support.