Help. Changing subnet mask looses connectivity.

HI,
I know this is basic but is giving me a lot of head ache.
I had a /30 between the Router(3925) and the ASA(5515).
Installed EHWIC on the router to support ASA failover.
I loose connection when I change the mask at /29.
So currently the vlan interface at the router has address 10.xx.xx.xx/30 and ASA interface has 10.xx.xx.xx/29.
This works fine but the moment I change router's mask to /29 it looses connection.
Cant figure out why and I have checked all I could.
- Did shut/ no shut on the interface
- Speed/Duplex settings are set to auto both sides.
Its frustrating. Please help.

Chris,
Pasting below relevant config of both the router and the ASA.
Router
interface Vlan10
description Router_FW1_FW2
ip address 10.xx.xx.2 255.255.255.252
ip access-group 120 in
ip nat inside
ip virtual-reassembly in
interface GigabitEthernet0/0/0
description ASA_Primary
switchport access vlan 10
no ip address
access-list 120 permit ip any any
ASA Config
interface GigabitEthernet0/0
nameif outside
security-level 0
ip address 10.xx.xx.1 255.255.255.248
route outside 0.0.0.0 0.0.0.0 10.xx.xx.2 1

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