The Instant Passed error code indicates that an LMP PDU or LL PDU ( for example LL_CONNECTION_UPDATE_REQ PDU for changing the connection parameter ) that includes an instant cannot be performed because the instant when this would have occurred has passed.
So, for example when the master sends this PDU (LL_CONNECTION_UPDATE_REQ PDU), it will sends an instant value as a part of this PDU.
The Instant field of the LL_CONNECTION_UPDATE_REQ PDU shall be used to indicate the connEventCount when the updated parameters shall be applied; this is known as the instant. The master should allow a minimum of 6 connection events that the slave will be listening for before the instant occurs.
Hope above clears about the error message.
Now to resolve this issue --
-> Are you changing the connection parameters after the BLE connection has established ? If yes, check what is the Slave latency number you have used. Try with a lesser number for slave latency (eg. 0)
-> Are you using the Low Power Modes in your design and also changing the WCO Sleep Clock Accuracy? If yes , please refer the page #12 for correct configuration from this document -http://www.cypress.com/file/140991/download
-> Which BLE device are you using ? If you are using a Module solution ( CYBLE-xxxxxxx-xx) part , assign the correct cap-trim values for the ECO as per the below document - ECO Capacitance Trim Values for EZ-BLE™ Modules - KBA218990