Quoted from WizzardRob:Sounds exactly like my issue with the building opto. It did not always register fast balls, it got worse quickly and stopped registering at all in game. In switch test i was able to register the opto mostly bit also got worse... i tried taping it like sigested here, didnt help.
I changed the receiver with a new one and everything was fine, catching every ball no matter how fast it is.
Have the same issue with the building opto not registering fast balls on my brand new Premium. Where did you get the new receiver? Is there a part-number for it?