It's most likely related to the MRF-300, especially if you those devices are working fine via IR.
What you can do is adjust the amount of IR each emitter is sending. First, try increasing slightly and see if it improves. If that doesn't work, set the emitter IR level half way for that device, pull the emitter off and hold it in front of the device while slowly moving it with each press to see if there may be a better location.
Sometimes the IR can oversaturate even on the lowest level, depending on how sensitive the sensor of the component is.
Let me know if this helps.
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