Housetrained Yorkie Has Started Peeing in the House?

I'm a little worried that we offer my 6 month Yorkie too many potty breaks, which has trained him to need to relieve himself every hour or so.

We work from home and were doing a great job (zero or one accident a week) by his 2nd month with us. Then we went out of town and left him with a friend who works 8 hours a day. The pup did fine with her, she has two other dogs and a backyard routine, but now that he is back with us he has had accident after accident, even just one hour after he peed.

When he is in my office and he scratches the door I take him out immediately. Sometimes he goes and sometimes he doesn't. He generally doesn't pee inside just after I bring him in, but rather an hour or so later. I crate him after he is taken outside and doesn't go, and he has peed in the crate now.

I just feel like there are so many mixed signals. Sometimes he whimpers in the crate and I think he wants to play, (so I ignore him), but today it seemed that he was whimpering to go out. I'm worried I've let him down and there is no return.

Any advice or ideas would be greatly appreciated.

By DT