The reflective stickers that come with Garadget and spares available in the garadget store are of the better quality than typical automotive/marine tape sold online. This can be part of the issue.
It doesn’t hurt to wipe the reflectors and sensor optics with the q-tips. I would try swapping the power adapter. Any USB charger will work for this purpose. Rarely laser is a problem but it is possible to replace it, the info on this can be found in this forum.