A400+remora x2

I have a problem with your boards. We purchased two boards A400BRMD to them, two additional board A400RABP2. Both sets of A400BRMD+A400RABP2 used with 12 FXO modules. Board individually work without problems, but when we put both boards simultaneously in a single server, they do not work correctly. At first everything is fine, but after a random period of time fees cease to make calls and incoming calls are handled, though instead of votes only hiss and crackle.

w2g1 Link encap:Point-to-Point Protocol
UP POINTOPOINT RUNNING NOARP MTU:8 Metric:1
RX packets:1373203 errors:0 dropped:0 overruns:118064 frame:118064
TX packets:1373203 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:10985624 (10.4 MiB) TX bytes:10985624 (10.4 MiB)
Interrupt:177 Memory:f8b20000-f8b21fff
Overruns escalate continuously, but not immediately after wanrouter starts.

CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
0: 601 0 0 2320391 0 0 0 0 IO-APIC-edge timer
1: 0 0 0 3 0 0 0 0 IO-APIC-edge i8042
8: 0 0 0 0 0 0 3 0 IO-APIC-edge rtc
9: 0 0 0 0 0 0 0 0 IO-APIC-level acpi
12: 4 0 0 0 0 0 0 0 IO-APIC-edge i8042
98: 0 0 0 0 0 0 0 0 IO-APIC-level ehci_hcd:usb1, uhci_hcd:usb2
106: 0 0 0 0 0 0 0 0 IO-APIC-level uhci_hcd:usb3, uhci_hcd:usb5
114: 0 0 0 0 0 0 0 41 IO-APIC-level uhci_hcd:usb4, uhci_hcd:usb6
146: 15112 0 0 0 0 0 0 0 PCI-MSI-X cciss0
162: 0 0 6649 0 0 0 0 0 IO-APIC-level ata_piix
169: 0 0 2266922 0 0 0 0 0 IO-APIC-level wanpipe1
170: 136621 0 0 0 0 0 0 0 PCI-MSI eth0
177: 0 0 0 2019451 0 0 0 0 IO-APIC-level wanpipe2
NMI: 0 0 0 0 0 0 0 0
LOC: 2320386 2320393 2320395 2320396 2320394 2320392 2320392 2320392
ERR: 0
MIS: 0