Interference with Bluetooth connection between sensor (Esp Libre3) and home WiFi router.

have you tried to change either band or channel that your router uses? eg if on 2.4g try switchit to 5g only. apart from that would try a different channel on router to see if t hat helps at all.

Have not had that issue however had had issue with various wifi devices after neighbor got a new provider and channel change helped with those.