Phone calls disconnect when the watch connected

hello
I have a Venu 3 watch and a Sumsug A73 phone. When my watch is connected to my phone, and I dial from my phone to someone, the call is disconnected when the person from the other side answers, when I disconcert my watch from my phone Bluetooth, it is not happening; It is very uncomfortable,I am not satisfied with the function of the watch and the contribution to the price, please help on this matter.