Minor difficulties that arise at random on mobile devices can be resolved with a simple reboot. Bluetooth, like any other function, can have unpredictable malfunctions, such as difficulties represented by an unstable or intermittent connection. Try rebooting your iPhone and your Bluetooth device to eliminate this as a possible reason. Allow 30 seconds for both your iPhone and Bluetooth device to power down before turning them back on.
Turn your Bluetooth device's pairing mode off.
Turning pairing mode off and on again may cure a minor software bug that is causing your Bluetooth device to disconnect. The majority, if not all, Bluetooth devices contain a switch or button for entering and exiting pairing mode.To exit Bluetooth connection mode, look for that button on your Bluetooth device and press or hold it for a few seconds.
After around 30 seconds, press or hold the button or switch again to return the device to Bluetooth pairing mode, then reconnect it to your iPhone 7 Plus.
