My rate lock died on a Friday because only the broker was counting days
First rental, small place, nothing exotic. The appraiser flagged the roof, which meant a repair and a reinspection, which meant the roofer's calendar, which was three weeks out in September. Everybody on the deal said some version of we'll get there.
My broker texted me on day 22 of a 30 day lock. She'd already priced the extension. Said if we push past day 28 the extension pricing steps up and she'd rather pay the smaller number on purpose than the bigger one by accident. My agent hadn't mentioned the lock once. Title hadn't. I certainly hadn't, I was busy arguing about the roof.
Then she did the thing I still think about. She pulled a parallel file with a second lender who would take the appraisal with a repair escrow instead of a reinspection, and she ran it far enough that it was real, and she told me she'd probably never use it. She didn't. We closed on day 29 with the roofer's invoice in hand and the extension cost me a few hundred dollars.
What I paid her for was not the loan. There were maybe four lenders who could have done this loan. What I paid her for was somebody with a calendar open on the second monitor who understood that a lock is a contract with an expiration and everything else on a closing timeline is a wish.
I'd have missed it. I'd have missed it by four days and never known why the rate moved.