SQL 2012 always on availability group

Hi,

We have five SQL 2012 servers distributed to three sites as follows:

site 1: has two database servers (HQ-DB1 and HQ-DB2)

site 2: has two database servers (S2-DB1 and S2-DB2)

site 3: has one database server (DR-DB)

there is a windows cluster configured for these sites and SQL 2012 always on availability group configured and created.

the replicated database configured as follows:

HQ-DB1 - Sync - Primary - Automatic failover checked - readable =yes

HQ-DB1 - Sync - Primary - Automatic failover checked - readable = yes

DR-DB1 - Sync - Secondary - readable = yes

S2-DB1 -  Async - Secondary - readable = yes

S2-DB2 - Async - Secondary - readable = yes

now the problem the database won't be replicated to S2-DB1 and S2-DB2 and gave us the following errors:

sometimes still synchronizing and won't to be synchronized

sometimes gave user (recovery pending)

sometimes gave us (not synchronized)

sometimes and original database become corrupted.

all SQL 2012 servers have SP1 and cumulative update package 3

We need solution here please.

Thanks.

Ahmad Matar