Location shifted automatically, though I am in the same place.

Dear All I am using   Edition Windows 11 Pro Version              25H2 Installed on      ‎11/‎24/‎2024 OS build            26200.7309 Experience       Windows Feature Experience Pack 1000.26100.275.0   Over the last couple of days, my location service/time zone has automatically shifted to China from my current location/time zone, though I am in the same place (at my office desk). When it does that, it shows a notification that, due to a location shift, the time zone has been shifted to China. After the incident, if I manually change the location/time zone and then enable it again, it works fine, but after a couple of hours, it behaves weirdly and shifts back to China. Can anyone suggest to me what could go wrong? I don’t think it is a BIOS battery; if it is, it should change the time, not the location/time zone. Hope it is not any malware? Can anyone suggest how to troubleshoot and find the actual cause?