It's the weather. Mine go out pee, come in, warm up, go back out to poop. I've been just waiting for them to ask, then they run out and run back in. I also take a towel and rub their legs and feet.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD