I found this fix specifically when looking for a way to fix disconnection issues with a Bluetooth mouse, but it fixes a multitude of issues as well.
Asus T100 frequently disconnects Bluetooth devices in an overly-aggressive effort to save power. Fix this by disabling Bluetooth power management.
First, make sure you have all the up-to-date drivers from Windows Update and from ASUS Live Update.
Next, open Device Manager and right-click Bluetooth Radio, then click Properties, Power Management tab, and uncheck “Allow the computer to turn off this device to save power” as shows in the screenshot below.
That’s all. After doing that, no more BT device disconnects!