Why Galaxy Watch 4 pops up SamsungPay randomly?

seems a problem related to the lower button (does not make the click sound) as if it were loose, causing invoking of the app to shows up many times during normal use (even in airplane/sleep mode) turning on NFC too. Watch and mobile both updated with latest patches.

UPDATE

as last resource I tried even to isolate the button physically, but the nasty SamsungPay still popping out.

Problem has been reported by many users and Samsung deny offering you to call a US toll-free number even when you report issue from other countries...