That's the even stranger part, yes there are some artists with more tracks than others. But this random favorite is just as likely to be an artist I've kept only 3 songs (or 3 albums) by and it will play them all across 9-12 tracks out of what are hundreds on my phone. Where I have 1 personal favorite artist with 7 full untouched albums that is rarely the one that gets repeatedly played, even though realistically it should have the highest odds to be. Every other artist has near half the albums or I have deleted at least half of their tracks, yet they hold the same odds.
I can pick that an artist with just 7 songs is about to be played more than others out of hundreds of songs.
The same song never play twice, just to make sure there isnt any confusion there. Where I say repeated I just mean repeatedly going back to the same artist every 2nd or 3rd song and often twice in a row. Now it occasionally within more believable chance plays 3 in a row, the chance i'd more beleivably expect it should be playing the same artist at all. But the other, it does this every 2nd or 3rd song, every time I've used the player since the update and every 2nd song since before that. It's never not done this in 3+ years.
There are even songs by each artist that are played much more often than others too for some reason, while some few that have actually sat on the list for the whole 3+ years and never played even once by random selection. That is more believable though given the amount of tracks I have and not really an issue to me. Just thought i'd mention it.