[asterisk-users] CAPI channel not available but nobody is using the system

[Tim Sharp]

I have 23 CAPI channels defined and normally multiple channels are in use during the day for outbound calling.  The problem is that every 3 or 4 months one of the channels becomes unavailable and then no calls can come in or go out on any of these channels.  CAPI INFO shows "Contr1: 23 B channels total, 22 B channels free."  To fix the problem I reboot the asterisk server.  First, is there a better way to reset the channels than rebooting?  Second, is there a way to bypass the unavailable channel in the dialplan?  Third, what is causing the problem and can I prevent it?
Thank you in advance.
Tim