Have you tried clearing the cache partition on your phone?
Thank you for reaching out. I would be happy to assist you further. Can I please have your full model number and IMEI in a private message: http://bit.ly/2JH2rq2
I solved the problem - buy another brand! Our company has many Samsung phones (S8, 9, 10), many of them give the moisture error message, sometime it will not go away. We are careful with the phones, ports are carefully cleaned by IT department, dried and checked with magnifier, we buy new Samsung brand USB cables and chargers, but still the issues remain. After much time wasted to find solutions (YouTube and forums are full of this issue, obviously it happens a lot) the phone may charge via USB again. With my own phone, immediately after a software update the problem is back. I like the phone, it is a pity we will need to get another brand, this is the last time we will try to fix it. Samsung is damaging their reputation, this issue has been happening for a long time to many users.
I was sceptical of this myself, though it worked for me on S20 ultra (oneUi 3) can't verify for other devices . Turn off the phone and plug it in to a generic slow charge brick. The phone should then display it at 0% but quickly shoot up to whatever percent your actually on. Then turn the phone on and low and behold it worked. https://youtu.be/SH7jIyyU9pQ tip from this YouTube video (step 3)
Edit: as soon as you've done this you can plug your fast charger back in
I bought note 10+ last year in September. 1 week ago started warning "moisture dedected on usb c port or charger" . I didnt drop my phone to water or never exposed with water. I called many times samsung n verizon. Samsung says warranty is over 2 months ago n gave technician number in Boston. Technician told me they have met with this kind of cases in the past and it is unknown issue which is related to mother board. Woow! After 1 year and 2 months this problem. My wife is using same iphone 5 years never had problem. I paid big money for this problematic phone. In next week i will apply to Attorney General to open case against Samsung to demand full refund n compensation for my loss because i cannot work 1 week on delivery platforms. I will never buy samsung again and i will switch to iphone as soon as possible.
My S9+ charges fine with no problems as long as I put it on charge before it runs out of battery.
If the phone gets to 0% and turns itself off it becomes a nightmare. I get a moisture detected error no matter what I do when trying to charge it again.
This can't possibly be an actual moisture problem because
a. the phone is not wet
b. it literally happens every single time the phone runs out of battery and I try to charge it
c. It never happens if I put the phone on charge before the battery runs out
Is there a fix for this bug?! It's driving me crazy!