I've owned a NES Satellite for roughly a year and up until now, it has worked surprisingly great; never noticed any lag or missed button presses during that time. However, recently when I was playing some NES games, I noticed that about 40% of my button presses weren't registering or were super delayed. Pressing Start or Select barely registered at all. Also the controller 3 and 4 ports weren't working period. I know it wasn't the controller since when I plugged it into the NES directly, it worked perfectly fine. Also the batteries were still good (even put in new C batteries and it didn't fix anything). The battery compartment was and still is clean, no signs of corrosion/rust. The circuit board inside of the Satellite looked fine too and as for the receiver end that goes into the NES console controller ports, from what I could see (a metal box was blocking most of that part's circuit board) looked okay too. With all of that looking okay, I had thought that maybe the two IR lights might've burnt out since the NES Satellite is 30 years old, but both IR lights were still blinking and reacting to button presses. And yes, the NES Satellite has been set to CTLR mode and not GUN mode along with facing the receiver part this whole time.
After all of those checks, I'm left assuming that the receiver end is the problem. Maybe I should look under the metal box in the receiver or maybe get a new Satellite receiver? I noticed that Camerica also made a receiver device for the NES, but I'd imagine that was made for one of their wireless controllers and wouldn't work with the NES Satellite.
I've already purchased a NES Four Score, so I'll have a replacement multitap for the NES that should theoretically be more reliable since it's a wired connection and I know if I wanted to keep things wireless, 8bitDo controllers exist that use the more reliable bluetooth connection, but for a good chunk of time the NES Satellite has been working great for me (even on HD TVs) and I was wondering if their was anything else I could try to see if I can get it working reliably again. If not, it's no biggie. At the very least I thought I'd share a problem I had with this device. Plus when I dismantled it I noticed that HORI seems to have manufactured these since their name is printed on the circuit board of the receiver part of the NES Satellite. So that's kinda neat I guess.