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If you see all assist lights flashing on the display and then the bike shuts down or see the ERROR 30, this is the error code for communication problem between controller and the display.
This is almost always a poor connection between the 1-4 wire harness. The first thing is to do it check all the connections. Disconnect the connectors and reconnect. When the cables are disconnected, check for debris or moisture or corrosion. You can use compressed air to clean them out.
In most cases this will solve the issue. If the problem persist, the 1-4 cable may be damaged or not functioning correctly. Contact support and we can move to the next steps to help get the issue resolved.