Hello Jay,
yes, another user of our Shakes reported a similar phenomenon, and this is what he did to solve the issue caused by RF interference: https://raspberryshake.org/amateur-radio-my-rf-shielded-raspberry-shake-vault-experiment/
This is the same article, but here on the community: My RF shielded in-ground vault experiment. Maybe you can get in touch with him (and possibly others) and you can exchange your ideas on the subject.