4G problem on a cisco 2900 router.

4G problem on a cisco 2900 router.

I have configured a Cisco 2900 router to support the 4G and I configured a tunnel but the 4G WIC is turning down and on repeatedly!

interface Cellular0/2/0
 ip address $$$$$$$$$$$$$
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip flow ingress
 encapsulation slip
 dialer in-band
 dialer idle-timeout 0
 dialer string lte
 dialer string gsm
 dialer string hspa-R7
 dialer-group 1
 async mode interactive
!


interface Tunnel3
 description VODAFONE 4G
 ip address $$$$$$$$$$
 tunnel source $$$$$$$$
 tunnel destination $$$$$$$$
keepalive$$$
!

I don't know what is the problem, the router was working fine till yesterday! 
there's nothing wrong with the operator just in case you're wondering, there are some other routers that are working fine.

                  New to ADSelfService Plus?