I also have problems with the Bluetooth connection. Especially with my hearing aids (Phonak Audéo Marvel). The S21 Ultra (Exynos version) sometimes doesn't connect to the hearing aids, sometimes it connects and immediately disconnects with the error "Connection cannot be established" (translated from German). Sometimes the Phonaks are connected but some apps don't have sound. Other times it lasts a while for the hearing aids to be connected... That's so annoying... My S7 Edge and S10 didn't have those problems... ... View more