I had this exact issue, and realized it was me. Are you sure you are selecting 'new coil'?
If you don't, the mod will resample/check the resistance, but only after the chip goes into sleep mode. So if you have sleep mode set to 30 mins, select no when putting on a new atmoizer (even only slightly different resistance), it will run fine until the mod goes to sleep in 30 mins of no activity. Then, fire it, and it wakes up and resamples.
Seems obvious, but I've done this many times when swapping RDAs with the same build in them. Either trying to avoid having to adjust wattage by NOT picking 'new coil', or not thinking to select new coil. Then, after the mod sleeps, it will ask again. Even with build being like 0.4 and 0.41 ohms, it will trigger the message after sleeping. I make sure now to ALWAYS select new coil when swapping the RDA and haven't had this issue since.
Also, the Recurve has a longer 510 pin than the Nudge. If I have the Recurve on and switch to the Nudge, it won't always read. I always take my bottle out and press on the bottom of the pin you connect the bottle to. Push the '510 pin' of the mod back up essentially. Then the new RDA always registers and reseats the pin where it needs it.
The 510 really doesn't seem to be spring loaded, I think it sits on a o-ring. So it doesn't always spring all the way back up if you remove an atty that has a longer pin on it.
At least that's my experiences.