I received the original build when 5.0 was released OTA for the Galaxy s5. When the "update" was pushed on 3/30, my phone developed an issue where the WiFi setting will turn itself on whenever it recognizes a WiFi. I have the "smart network switch" unchecked on my setting. This is a problem because Comcast has a hotspot network set up around Nashville so I'm CONSTANTLY having to turn off the WiFI. Just to reiterate, this behavior only started after the update on 3/30.
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It wasn't turning on immediately, but it usually happened within about 5 mins of shutting it off. I did not have this issue with 5.0 prior to the 3/30 update.
Regarding Safe Mode - that fixed it!! Here's how it went down - turned it on Safe Mode for a couple of hours and I did NOT experience the concern. Within 5 mins of switching off safe mode, the WiFi had turned itself on. Went to application manager and started looking for running apps to narrow down the suspects. Took a shot and uninstalled a rather useless"Xfinity Wifi Locator" app and it seems to have been the culprit. Appreciate the help - it was driving me nuts.