Wifi Pods no longer have good speed

My wifi Pods used to get me about 200-250Mb download speed but recently they've struggled to get over 60/70. 

Nothing has changed in my house. 

I've tried:
Power cycling the POD.
Restarting the router.
Power cycling the router.
Swapping the POD out for another one.

Still not getting about 60/70Mb