98 4x4 Blazer starting problem

Having a problem, sometimes when I come out in the morning, I turn the key and nothing, no crank, nothing. I try it again, and starts right up. The other day, I tried 4 times, nothing, no crank, no nothing. Then on the 5th turn, it turned right over. Doesn't happen all the time, every coupke days. ANy idea what may be wrong..Thanks!

Poor or corroded battery cable connection. Could be at the battery, body ground, engine ground or starter. Take 'em all apart, shine 'em up and tighten 'em up.