Pool pairing : lync client doesn't reconnect to backup pool

Hi
I'm currently testing lync 2013 failover via pool pairing. (IM only)
Once I stop the Frontend service however on the pool01 server, I get a notification on the lync client : "connection was lost. Reconnecting.."
However the lync client doesn't connect again (while it should reconnect with limited functionality)
Before simulating (shutting down the service)
> Get-CsBackupServiceStatus shows "final state" - "normal state"
> pool2 is configured as backup of pool1 and visa versa
> cms is hosted on pool1 server
> 2 std servers (one with pool1, other with pool2)
SRV records
1 with priority 0 and value _sipinternaltls._tcp.customer.com, which points to hostname pool1.customer.com
1 with priority 10 and value _sipinternaltls._tcp.customer.com, which points to hostname pool2.customer.com
I've upgraded the lync client to the latest build to be sure.
Anyone knows where to look? Settings seem to be correct.

I've left all defaults regarding failover.
something to add :
* the servers are installed in the domain a.prod.customer.com
* the sip addresses of all users are @customer.com
* the users can be situated in the domain a.prod.customer.com, b.prod.customer.com or c.prod.customer.com
I've just tested and when I start a Lync client, I can see both SRV records popping up, so discovery of these records seem to work correctly.
When I stop the frontend server of the pool the user is on however, I don't see any redirect in the logs.
1 Login: PASS
2 Lync-autodiscovery: FAIL (hr = 0x80004005)
Lync autodiscovery completed with hr: 0X80004005 sipint: sipext: authint: authext: wts: retry: 0
3 DNSAutoDiscovery: PASS
4 Lync-autodiscovery: FAIL (hr = 0x80004005)
Lync autodiscovery completed with hr: 0X80004005 sipint: sipext: authint: authext: wts: retry: 0
5 DNSAutoDiscovery: PASS
6 Lync-autodiscovery: FAIL (hr = 0x80004005)
Lync autodiscovery completed with hr: 0X80004005 sipint: sipext: authint: authext: wts: retry: 0
7 DNSAutoDiscovery: PASS
8 Lync-autodiscovery: FAIL (hr = 0x80004005)
Lync autodiscovery completed with hr: 0X80004005 sipint: sipext: authint: authext: wts: retry: 0
9 DNSAutoDiscovery: PASS
*edit*
When I logon the first time with a user who's primary pool is down, I can see this in the lync client log :
1 Login: FAIL (hr = 0x1)
2 server(s) returned
Server: server1.a.b.customer.com:5061, internal, discoveredadded to list of auto-discovered servers
Server: server2.a.b.customer.com:5061, internal, discoveredadded to list of auto-discovered servers
signin to server=server1.a.b.customer.com.int:5061, internal, discovered
redirectedServersList=
1.1 Lync-autodiscovery: FAIL (hr = 0x80004005)
Lync autodiscovery completed with hr: 0X80004005 sipint: sipext: authint: authext: wts: retry: 0
1.2 DNSAutoDiscovery: PASS

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