my c5 almost didnt start?

I was driving it yesterday and i stopped for a little while then when i went to start it i turned the key and nothing? Electrical system seemed to be ok all lights were on battery was 14 volts . Them after
about 25 times it started to turn over but keped stalling right away . Then after about 30 times trying to keep it running it just fired up like there was no problem? Anyone know what might be the problem ? bad starter?
Bob
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