There is a trick when Maybank TAC comes in very late.

The FPX gives 15 minutes to proceed with the payment while Maybank requires the transaction to be done within 3 minutes.

Normally, i try to put in airplane mode in order to "reset" the network connection. When the time is running out, i will press the "Go Back" button which will reset the 3 minutes timing and request for new TAC. I normally only did once, so I still respect the 15 minutes delay to perform the transaction.

Hope it helps.