The same thing happens to me with my Avent steraliser.
For us, once they are cool enough to touch, we put enough cooled boiled water into them for the feed, put them together and put them in the fridge.
When its time for a feed, we pull one out, pour the water into a steralised glass jar and heat the water in the microwave in that (not in the bottle because of the BPA risks). We then put the water back in the bottle and scoop in the forumla and shake it up really well so there are no hot spots.
Works well for us!
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