There is some logic about it but it is not down to luck. If you are having a good run then you are probably more confident about your selections, but this run has to eventually come to an end. Having a bad run, you doubt yourself and try to find something maybe less obvious as to why your selection may not win and change that. Therefore with the “winners” you are not backing, are you certain if you’d had your hard-earned on these, you may have looked deeper into the race and changed that selection? There are also the exaggerations. You forget the odd loser when you are winning and vice versa.
So I hope it picks up sooner rather than later but we all have good runs, bad runs and most of the time just average runs.