People gettin' hit by the summer bug...nothin' more nothin' less. From what I can remember, it's the same thing every year at around this time.
Of course people are gonna have reasons like "it just isn't fun anymore" etc. ... but the fact is, it's gettin' warmer outside, the days are gettin' longer...
But come autumn, people seem to get hit by the flyin' bug en masse again.