Gotta get the actual charger for the s20. My newest wireless charger won't keep up with my s20 unless I close down every app and shut it off otherwise its like using a regular charger and says something along the lines of "this phone uses to much energy to wireless charge" in not so many words. You need to wait for the wireless charger to come out for the s20. The processor is using to much to keep up with the low wattage of your wireless charger.
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