Galaxy s7 bluetooth works but will only use 2 devices

I have galaxy S7 with android 7 and broke down and bought a Bluetooth polar HM, wahoo speed sensor and wahoo cadence monitor. The phone and zwift android see them all but will disconnect the cadence or speed. If i reconnect to the sensor it will disconnect the other and back and forth. It will only use 2 devices. Wahoo software says the firmware is up to date.