The most common error is not contacting OR insufficient contact downline member !
I think that the contacts are never too much for downline member.
Downline members need to help and point out the important things
Otherwise it will be proper to send your members and downlines messages once per week targeted at actions and encourage.
When there's a issue that needs to be solved communication should be current via telephone, cell phone or e-mail and etc. depending on what is available.
Your team (downline PSA and CSA) should always know that you are available to them help at any time.