4. Xantech 49010d Designer Micro Link(tm) Infrared Receiver is not working properly. I have to HOLD the button for a sec or two for it to react.

Again, you're seeing a symptom. Have you tested this with a phone or other IR sensing device and a timer so you KNOW you don't get an output from the receiver until an entire second, or two, have passed? This is a truly bizarre symptom!

Yes. it seems an unusual symptom. The problem is: lets say I am changing the channel - with old IR receiver (xantech non lcd proof), I can just tap on the channel up button and the channel on the DVR changes.
But with the 49010d - i actually have to HOLD the channel up button for longer than I am used to (and like).. the reaction to the button pressing happens only if I hold the button for a while - I can't say whether it is 1 sec or not.. I know that I don't like to have to do so - especially, because the older ones worked perfectly well.