How do I Stop Every X Seconds from creating an object

I set an object to be created every 7 seconds on the game screen. When you lose all your lives it sends you to a game over screen. There is a try again button that sends you back to the game screen. The problem is that a second object spawns too quickly after the first one when you choose to retry. How would I fix this? I've tried grouping the every seconds event and deactivating it on the lose condition and game over screen but, it didn't work.

Use the Timer behaviour on an object instead of 'Every X seconds'. You have complete control over the timing - you don't with 'Every X seconds'.

Can you explain that further? I don't really understand

https://www.scirra.com/manual/167/timer

Start the timer 'On start of layout' and stop it when you move to the Game Over screen. It's (roughly) that easy.

I need to create an object every 7 seconds. how can I do that with the timer?

'On timer'

Thanks for the help!