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this'll probably something you've already checked, but do you have a new case?
this is my first phone with wireless charging and it didn't occur to me. I returned both my Samsung charger and the wallet case to bb, where I got my phone.
I've since got third party wireless charger on Amazon and a simple case.
My wireless charging stand would constantly cause a pop up on the s8 and s8 Plus "wireless charging paused" and would refuse to charge. Then I tried a different USB cable but it was the same so I tried a different plug (old iPad charger) and that was what made the difference and it's been fine since. Obviously needed higher amperage