I'm having the same exact issue with my S8! My location in Google Maps (blue dot) will not stay in place (also messing up my Weather Channel widget) most of the time. It will randomly change my current location back to an area about 25 minutes away from me where I was earlier that day. I also end up having to toggle the GPS on & off to temporarily fix the problem. But, it only works temporarily. Strangely enough, when I notice my Weather Channel widget shows the wrong location (area I was in earlier), I open Google Maps & the blue dot will 1st show my current location, and then change to the location I was at earlier in the day. When I calibrated it before (or pressed the Google Maps GPS reset button), it worked, but not anymore. T-Mobile claims it's a Google Maps issue (which may be true because 2 updates ago I had no problems & people are complaing about it now on the Google Play Store), but a Google representative at Best Buy told me it's a T-Mobile issue. I also noticed this started happening after the last phone software update. Regardless, who's ever fault it is, I hope there's a fix soon because it's very annoying and makes it unreliable. All my past phones have been Galaxy, and never had this problem. Glad to know I'm not the only one.
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