I had my oneplus 8 pro since 3 days. Went to the pool and submerged it not more than 50cm for just a few mins. Gently and slowly.
Some fog appeard almost immediately over all the lenses. On the inside part.
Right after the screen started throwing flash lights and the phone was obviously not working fine anymore. After a few more mins the phone died completely.
I dried the phone carefully and waited about 12 hours and it started to work again just fine.
I sent it back to Amazon and replaced with a new one the day after.
But my question is: was just a very unlucky unit? Or?
As a side note, I have been using my other phones (huawei Pxx pro) under water, also at the sea, a LOT of times and also deep, to make nice underwater videos and never had a single problem.