The R5-A3 I got from KD had some issues, possibly with the clicky. The light tends to cut in and out. It's a pain in the ass when you have to tinker with it in the dark. Also the glow in the dark washer doesn't seem to fit in it's crevice, and so is not doing its job to keep water out of the emitter. I would not buy the light again because of these issues.
You posted 2 months ago you were having problems with the clicky switch take it apart and clean it with WD40 or order a new switch. It is to late to send it back which is what you should have done in the first place.
Here is the link 5 new switches for 1.88 with free shipping.