64 Availability groups max on SQL STD : Failure when attempting to create a new NetBIOS interface while bringing a resource online
The Microsoft EnableNetBIOS documentation states:


  There is a limit of 64 NetBIOS devices in the cluster. 


You should be able to just ignore this--disabling NetBIOS on clusters is recommended and SQL Server doesn't need it.  See Speeding Up Failover Tips-n-Tricks.