15 replies but less than 24 hours. Give it time. Not everyone checks 10 times a day
I would lean towards dirty bottle too.
Keith, you're not talking about opening warm bottles are you, just bottles that have been warmed up? Do you have any of those bottles left? And good notes from your brewing? You could take one of those bottles, degas it, and check the gravity to see if it is lower than it was at bottling. You'd have to compare it to one of your IPAs made without US05 to see how that affects the gravity too.
I would say you could check the carbonation in the bottle, but I doubt you have the equipment to do that. I know a brewery around here that does, the machine pierces the cap with a needle and measures the pressure. Pretty cool equipment, but not free
You don't use US05 for any of your other beers?