This was exactly my issue on my S9+. Ever since the Android 9 update with One UI I've had this issue. It's been driving me crazy! I thought it had something to do with a wireless charger I picked up around the same time. I've checked and rechecked all my apps and could find nothing. I can't believe they turned this on by default, it is very annoying.
Thank you mysterious stranger, I made an account just to post this because you deserve a Kudos.
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