Before you start looking for evidence of a source, you need to show that the phenomenon actually exists. That has not been established, IMHO[1]. This is like speculating about where "Nessie"[2] came from when you haven't even shown that there is a "Nessie" yet.
[1] https://www.nytimes.com/2024/03/18/us/politics/havana-syndro...
[2] https://en.wikipedia.org/wiki/Loch_Ness_Monster