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Tijs
edscoble
What pressure do you run them at? My guess is that the air is warming and expanding when the bike is indoors.
25mm is at the tube's limit and if they quite thin, the expansion may be enough to burst them. Try getting some where 25mm is the minimum size or in the middle of the range.
Considering the modest difference in price between cheap and expensive tubes, might as well treat yourself! Any of the recognised brands will do, the only ones I can remember hearing bad things about are (I think) Specialized.