Group IP dropping packets - how to troubleshoot?

I'm trying to replicate 2 EQ groups over remote subnets.  The group IP on one side is dropping a significant amount of packets (90%+), but all other IP's are fine. GroupA has 1 SAN, GroupB has 2.

Example

GroupA GROUP IP 10.1.0.10 /24

SAN Connection 1 - 10.1.0.11 /24

SAN Connection 2 - 10.1.0.12 /24

Dedicated management port on a different subnet

GroupB GROUP IP 10.2.0.10 /24

SAN Connection 1 - 10.2.0.11 /24

SAN Connection 2 - 10.2.0.12 /24

Dedicated management port on a different subnet

From the GroupA 10.1.0.0 /24 network, I can ping all IP's in GroupB without any issue, 10.2.0.10/11/12. 

From the GroupB 10.2.0.0 /24 network, I can ping 10.1.0.11 and 10.1.0.12 without any issue.  But for the Group IP of 10.1.010, the ping will rely maybe less than 10% of the time.  It will go in streaks where 50-100 ping attempts are successful, then it will start dropping 25-30 attempts in a row, succeed for 1 attempt, and drop the next 25-30 attempts, and continue in this pattern.  If you look at the sequence ID of the successful ping replies, the gap is usually consistent (ie attempts 10, 40, 70, 100, 130 will work).

From GroupA I can always test replication partnership successfully, and it responds instantly.  From GroupB the test partnership will work when the ping replies are working; otherwise it will time out.

Any suggestions on how to troubleshoot?  I'm a little baffled since the Group IP is just a virtual IP riding off the 2 data connections (.11 and .12) which don't have any issues on their IP's.

GroupA SAN is PS6510 firmware 7.0.7.

GroupB has PS6210E and PS6510 also both at firmware 7.0.7.