When business partners avoid difficult conversations about role clarity

My business partner and I run a small freight brokerage and we've been splitting loads based on whoever answers the phone first rather than actually talking about who should handle what accounts and I think we're both avoiding the conversation because we don't trust each other's judgment anymore but we can't keep operating like this. Our best clients are starting to notice the inconsistency and I'm worried we're going to lose them if we don't figure out how to work together properly.