Conversation so far:
What kind of personnel changes were happening?
Motown struggled to find good material for many of their acts after the exit of Motown contributor and Reeves' mentor William "Mickey" Stevenson.
Did they still have any hit music?
"Love Bug Leave My Heart Alone" (US #25; R&B #14) and "Honey Chile" (US #11; UK #30; R&B #5.
What else happened in their career?
That same year, label changes had started to take effect.
What label changes?
CANNOTANSWER.
What other changes were occurring?
However it was the infighting among the members of the Vandellas that led to their problems.

Question: What problems were happening?
Self-contained rewrite: What problems were happening among the menbers of the Vandellas?