Samsung S8 Plus - Moisture damage issues

I purchased a Samsung S8 Plus about 2 years ago, a few months later my phone brought up the error that it detected moisture and I should not charge it. This surprised me as the phone was apparently water resistant and had not been anywhere near any moisture? Nevertheless, the error never cleared and I had to send the phone for repairs. The phone never worked well afterwards so I then bought a new S8 Plus last year and to my surprise I saw the same error message now in December, despite ensuring it is completely dry and left off for some time the error has still not cleared. This is extremely frustrating considering the handset is supposed to be water resistant. As a premium handset, I am very dissapointed in the device and expect a resolution from Samsung.