Fast charging no longer works after I updated my Verizon Samsung S7 - last system update shows as G930VVRU2APG5 (update for FM radio, etc).
Update drained a good chunk of the battery and then fast charging stopped working. After running through tier 1 support was told by Verizon that...
I updated on Verizon for my Galaxy S7 tonight and my fast charging stopped working. Was told by Verizon it was due to the software update and that Samsung was working on a patch. Not sure if that is the same issue you've encountered.