DMVPN ip NHRP never expires on remote end

Hi All
Creating DMvpn with one central site and 6 remote. Problem is if
problem on internet IP NHRP never expires on remote ends. as a result
when internet returns tunnels do not reconnect to central site. problem
can be fixed by reseting tunnels interfaces at remote end. I have set
IP NHRP Hosltime to 60 but this makes no difference.
When command Show IP NHRP is done at remote end it flags expire never.
interface Tunnel1
bandwidth 256
ip address
no ip redirects
ip mtu 1400
ip nhrp authentication dmvpn
ip nhrp map multicast dynamic
ip nhrp map x.x.x.x
ip nhrp map multicast x.x.x.x
ip nhrp network-id 99
ip nhrp holdtime 300
ip nhrp nhs
no ip route-cache cef
no ip route-cache
no ip mroute-cache
ip ospf network broadcast
delay 100
tunnel source Dialer1
tunnel mode gre multipoint
tunnel key 1000
tunnel protection ipsec profile mymap

Any help would highly appreciated
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Since you are using DMVPN you may also be interested in looking at this Cisco doc;
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