Yeah, I went thru that stage too! He's being a boy and a puppy still.
I am thinking he has too much free room. You might need to limit his freedom, blocking off certain areas, etc.
I remember at that age, I would wash their blankets and beds and a few hours later, pee again
Start back at the basics, and PRAISE and TREAT like CRAZY for peeing on the pads.
- Also neuter as soon as you can, that will help too! TJ was suppose to be at 6 months and he was under 3lbs at the time, but he got sick and I had to wait another month, during that month he 'learned' how to lift his leg to pee...(I wish he would have stuck to the sqwat (sp?)