I've been recently playing in Open C for the first time (with the first string tuned up to E) which I like very much, but today perhaps because there was a change in the weather and the heat came up, the string snapped (when I was tuning in back down to D). i noticed that, in fact, all the strings had tightened up and had to be tuned down. I was using a Deering 1st string which is 0.010., the same width as their 5th string. My question is whether I should use a thicker string to prevent this from happening again.
Thanks,
Richard