BRI goes up and down

[nabs79]

Hi

I have a problem on my BRI ports they go up and down
here is the configuration of my gateway 2801

no aaa new-model
network-clock-participate wic 1
network-clock-select 1 BRI0/1/0
network-clock-select 2 BRI0/1/1
ip cef

interface BRI0/1/0
no ip address
isdn switch-type basic-net3
isdn point-to-point-setup
isdn incoming-voice voice
isdn bind-l3 ccm-manager service mgcp
isdn send-alerting
!
interface BRI0/1/1
no ip address
isdn switch-type basic-net3
isdn point-to-point-setup
isdn incoming-voice voice
isdn bind-l3 ccm-manager service mgcp
isdn send-alerting