Reflection very low

[garadget]

Sounds like the laser diode may be failing. They are not difficult to replace if you are into DIY projects:

Low reflection low laser

Yes, I warranty all items for a year. From your responses it sounds like you will have no difficulty with this particular fix. Here are the process: open your unit and remove the PCB. It’s all once piece. pull off a plastic spacer holding laser and photo-transistor in the direction of the laser don’t remove the leads from PCB, instead heat up the ends attached to laser one at a time leaning the laser away until completely separated put the new laser into the spacer and slide it back onto PCB s…