402U wireless receiver forgetting the remote

I have just installed two new 402U wireless receivers, (a week ago) and one is forgetting the remote control approximately every two days. (three times so far in seven days)
I have cleared programming and reset, then altered input voltage from 12v to 15vDC but to no avail.
The receiver is still forgetting the remote control.

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If the same remote works fine on the other receiver, then the receiver might be defective.
Thanks.

Yes the remote is working fine with the other receiver.

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