If you are using infrared repeaters or extensions, make sure to place the small IR emitters on the equipment from top down instead of from bottom up, then tape them into place.
One of the top failure complaints I have received over the years is from equipment that can't be controlled today, but was working yesterday. Upon arrival, I find that the IR emitter has fallen off the BD player/cable box/Roku, etc. and that just putting the emitter back on corrects the problem. Of course, the tape won't hold, and it doesn't fix the issue long term.
By putting the emitter on top of the piece of gear, and taping it into place, the emitter may still come unstuck from the front of the equipment, but it has nowhere to fall to. It just hangs in front of the IR window and continues to work just fine.
EXAMPLE (from Google) - Incorrect, that emitter falls off and the receiver won't work!
Correct! If the emitter becomes unstuck, it will dangle in front of the receiver and still control it.