Jeff Layman wrote:

It adds "To prevent interference the handshake protocol is integrated
with a precise algorithm, a 32-bit address. At every interval
communication protocols are sent three times."

If that is the case for the switch I have, then it is even stranger that
/something/ is interfering with the signal, especially as it so specific
that it only interferes with one of the two gangs.

is it a dual receiver you're using, or two single receivers?

if the latter I'd look at the receiver, if the former is it possible one
of the switches isn't "powering" the energy harvester properly?