After upgrading to OS X El Capitan we’ve seen odd Bluetooth connectivity issues with the Apple Magic Trackpad. If you run into problems, the best thing to do is try to re-pairing your devices or powering them on and off.

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Users with OS X El Capitan Bluetooth connection issue should install OS X 10.11.2, as it includes fixes to prevent Bluetooth devices disconnecting. Users can also try to contact Apple Support Number or visit Apple Technical Support page for more help on fixing Bluetooth problem with the El Capitan OS X version.  If this doesn’t fix it, you can try turning your Bluetooth off on your Mac. This can fix many problems. Be careful turning Bluetooth off on your Mac if you only have a Bluetooth mouse and a Bluetooth keyboard.

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External Link: 800-961-1963-OS X El Capitan Wi-Fi Problems; Get Apple Support | http://bit.ly/2cs8hLQ | https://goo.gl/SGGIJe