Is it normal for property management to hold a minimum?

[Kevin Feng]

I use Crestcore in Memphis, TN.  Not a very responsive company. I wonder if it's normal for them to request and hold a minimum amount in my account for repairs.  At least that's what they claim as the purpose.  I am not a big fan of the idea but lack experience to understand.  Does anyone know if this is common or not?  I want to stop this.