No random number generator is truly random. Over time, you will see a slight effect from auto-correlation even from those based on time codes. Instead, you see the results of a pseudo-random number generator. That does NOT mean there is a bias. However, runs of good and bad luck will be slightly longer than a true random number creates.

In other words, if you are on a cold streak then take a break. If you are on a hot streak, ride it.