This winter I had "incidents" while riding on the rollers:
1- Two flats. The first one due to a cut in the valve caused by the valve hole edge, riding with low tire pressure (understandable). The second one, I can't explain.
2- Last night, without obvious cause I heard a loud "pop", and immediately felt increased resistance. See the pictures below. It's a Mavic Open pro rim with about 12K-14K miles on it. WTF?