Macbook Pro doesn't connect to the wifi - 'can't find IP address'

I have a Macbook Pro and since getting a new router every time I wake up my mac or turn my mac on, it doesn't connect to my wifi properly. This doesn't happen with any other device in our home, so I reckon it must be a problem with my mac.

It attempts to connect, but 90% of the time I get that it can't find an IP address and then the other 10% it's that it's got a self assigned IP address. It sometimes asks to put my wifi password in but when I do it says it's incorrect (even though it isn't).

I've tried literally everything I can find on the internet. The only thing that works is turning my router on and off again and then it automatically connects.

Please help! It's driving me mad.