When people call me and I respond to the call on my iPhone (not on the watch), the call starts but my iPhone keeps vibrating and I cannot hear anyone and they cannot hear me. Restarting the watch and iPhone works but it's indeed highly unpractical. Turning off Bluetooth on the iPhone also solves the issue, but again not why I bought the watch... I am on iPhone 12 (iOS 15.4.1), Venu 2 Plus FW 8.12 (it tells me it's up to date)