New to Trixbox - Inbound

Hi
I am running Trixbox v2.6.2.2 on a vmware machine (downloaded the vmware image)

Everything works well except for the inbound calls. About 3 or 4 times a day they seem to stop. I think it happens when the system is idle but i can't be sure.
I reset the trixbox and exery thing works again!! For a couple of hours or so....

Here is the details:

Network Adapter - Bridged (on a reserved public ip 10M) - the traffic can get high at times

5 Indound routes - through callcentric (I see incoming calls in the callcentric log)

added extensions_custom.conf -------------------------------------------------------------------------------
[custom-incoming]
exten => s,1,Set(Var_FROM_DOMAIN=${CUT(CUT(SIP_HEADER(TO),@,2),>,1)})
exten => s,2,GotoIF($["${Var_FROM_DOMAIN}" = "callcentric.com"]?5:3)
exten => s,3,GotoIF($["${Var_FROM_DOMAIN}" = "ss.callcentric.com"]?5:4)
exten => s,4,GotoIF($["${Var_FROM_DOMAIN}" = "66.193.176.35"]?5:7)
exten => s,5,Set(Var_TO_DID=${CUT(CUT(SIP_HEADER(TO),@,1),:,2)})
exten => s,6,GotoIF($["${Var_TO_DID}" != ""]?ext-did,${Var_TO_DID},1:7)
exten => s,7,GoTo(from-pstn,s,1)
exten => h,8,Macro(hangupcall)
---------------------------------------------------------------------------------------------

Can call extention-to-extension when the incoming is down with no issues.
Can also call out with no issues

I am real new to this, any help would be appeciated