Workplace injuries. Not from any 'adversary'. Government doesn't want to admit liability for millions (billions?) in workplace injury claims.
When the Syndrome hits in places all over the US and elsewhere (including Washington DC itself), the implication would be that some 'adversary' has weapons everywhere all over the world. That's a ridiculous idea. Far more likely is that the Government guys are doing something at work that damages them.
21st century version of 'Agent Orange', most probably.
I stand by my assertion that Havana Syndrome (even those cases very close to the White House in Washington DC) are caused by workplace injuries. It wouldn't be the first time (or last time) that the USG has denied any liability for the consequences of its actions on its own personnel.
When the Syndrome hits in places all over the US and elsewhere (including Washington DC itself), the implication would be that some 'adversary' has weapons everywhere all over the world. That's a ridiculous idea. Far more likely is that the Government guys are doing something at work that damages them.
21st century version of 'Agent Orange', most probably.