Shuffle artist doesn’t stick to the same artist

[Geotadams]

Plan

Premium

Country

Germany

Device

iPhone 7

Operating System

iOS 12.2

My Question or Issue

I was trying to shuffle with one specific artist (Marteria) this morning as I often do. Instead of working like normal, it would either play one marteria song and switch, or immediately start with a different artist. It didn’t even remain within the same genre of rap, instead choosing seemingly random German music. Is there a way to fix this or is this permanent? A large amount of my Spotify time is spent shuffling individual artists.