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