Where the power is cutting in/out, please try the following:

Wall plug - Check the plug is secure in the socket, try a different extension / wall socket

Adapter - The adapter has 2 connection points (from wall-plug-to-adapter and adapter-to-bike-input point), check that these are secure.  The EX5s bike has 2 power inlets, to the front and rear, try both.

Bluetooth light- Check whether the  Bluetooth blue light is flashing (pairing mode)

EX3 - checking console connectors

• UNPLUG you power adapter from the bike before proceeding
• If the Bluetooth light remains lit on your EX3, press and hold for 10 seconds until all power is discharged from the console.
• Carefully release both connectors by pressing the release tap,  these are latched / clip connectors much like a landline telephone socket.  Access may be easier if the console is detached from the handlebar (4 small screws on underside)
• Check for damage or loose wires, re-insert connectors
• Reconnect power adapter to bike and power on

Sport -  checking Bluetooth connector

• UNPLUG you power adapter from the bike before proceeding
• Carefully unclip the connector by pressing the long tab
• Check for damage or loose wires, re-attach
• Reconnect power adapter to bike and power on