Fixing Floor Chipboards after Wall Removal (creaking problem)

Hi guys!

I was wondering if anyone can help me with advice on how to fix floor chipboard after removing a wall?

In one of the rooms we just put more wooden blocks underneath for better stability and attached a cut-to-size piece of chipboard; put overlay and laminate on top, however with time this area started creaking so I want to avoid this problem this time.

I guess the best thing to do would be to replace all the chipboard in the room but I was wondering if there is a less inconvenient way to fix this?

Thank you in advance.