PowerVault MD3820f Active RAID controller changing

We have a M1000e with M620 blade servers and the MD3820f with the MD1200 expansion. Currently we run XenServer 6.5 SP1 with all hotfixes applied. We have defined two Virtual Disks in our storage. The first (SAS_HDD) has RAID Controller 0 as the preferred controller and the second (SAS_SSD) has RAID Controller 1 as the preferred controller . The problem is that after some time we get an alert that SAS_HDD has RAID Controller 1 as the Current Owner. The /etc/multipath.conf that shipped with XenServer had no definition for MD38xx but only for MD36xx, so I copy pasted it and changed the name to read MD38xx.

Attached below is the current /etc/multipath.conf that is on all hosts.

defaults {
user_friendly_names no
replace_wwid_whitespace yes
dev_loss_tmo 30
}
devices {
device {
vendor "DataCore"
product "SAN*"
path_checker "tur"
path_grouping_policy failover
failback 30
}
device {
vendor "DELL"
product "MD38xx(i|f)"
features "2 pg_init_retries 50"
hardware_handler "1 rdac"
path_selector "round-robin 0"
path_grouping_policy group_by_prio
failback immediate
rr_min_io 100
path_checker rdac
prio rdac
no_path_retry 30
}
device {
vendor "DELL"
product "MD36xx(i|f)"
features "2 pg_init_retries 50"
hardware_handler "1 rdac"
path_selector "round-robin 0"
path_grouping_policy group_by_prio
failback immediate
rr_min_io 100
path_checker rdac
prio rdac
no_path_retry 30
}
device {
vendor "DGC"
product ".*"
detect_prio yes
retain_attached_hw_handler yes
}
device {
vendor "EQLOGIC"
product "100E-00"
path_grouping_policy multibus
path_checker tur
failback immediate
path_selector "round-robin 0"
rr_min_io 3
rr_weight priorities
}
device {
vendor "IBM"
product "1723*"
hardware_handler "1 rdac"
path_selector "round-robin 0"
path_grouping_policy group_by_prio
failback immediate
path_checker rdac
prio rdac
}
device {
vendor "NETAPP"
product "LUN.*"
dev_loss_tmo 30
}
}