It's not Samsung's problem. It's a bug in the Xfinity Wifi Settings app, which is Xfinity's problem. I'm not surprised that your wife hasn't experienced the problem, yet. It seems to be sporadic. Yesterday after trying a network reset, it kept happening. Today it hasn't happened yet. Have her keep checking, just to be safe. I've tried disabling the Xfinity wifi Settings app, denying it's pop-up, force stop, changing the Samsung internet settings and doing a network reset. After trying all that and reading the October thread, I came to the conclusion that it's Xfinity's problem and they need to fix it.
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The Xfinity Wifi Settings app had a problem last October. On 1/24/20 the version 126.96.36.199 was released with the same bug. The problem causes the app to sporadically turn off wifi, even at home. This causes the mobile data usage to increase. (Mine jumped from .43 gig to 2.36 gig in 2 days!) The Xfinity Mobile technicians are unaware of the problem. They can't fix it, although they'll try. They can credit you for the mobile data increase. My opinion is that Xfinity should be responsible for all mobile data usage from 1/24 until it's fixed. The permanent fix is for Xfinity to release an update. There's a list of temporary fixes in a related post, which can be found by googling Xfinity Wifi Settings turns off wifi randomly. Samsung phones impacted (that I know about): A50, S9, S10, S8+ ETA: Adding to the list of impacted phones.
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