Nikki Mudarris' feud with her ex, LiAngelo Ball, is heating back up -- this time, the reality star is accusing the rapper and athlete of being radio silent toward their kids for more than a month.
Mudarris and the middle Ball bro recently broke up after a 3 1/2 year relationship ... after she claimed the "Tweaker" artist abandoned her and their two kids for another woman he allegedly impregnated.
Since the split, Mudarris and Ball have been trading jabs on social media .