VPC N5k Switch Failure causes connectivity disruption

Hello,
I have configured enhanced vPC on 2 n5k and B22 FEXs (vPC from 5k to B22, and vPC from B22 to blade servers).
Everything is running smoothly, except when I power off one of the 5k, the connectivity to the blade servers is lost, comes back up for a short while, loses connectivity again, and after a few minutes comes back up for good.
From the logs I can see that all the port-channels (peer-link, to the FEXs and port-channels to other switches in network) get in down state, then fizical interfaces start coming backup in fabric mode, then port-channels, see FEXs starting to get online then all the port-channels go down again and then whole thing starts again.(all of this is hapenig with one of the 5k powerd off, same thing hapens with promary and secondary vpc).
Connectivity is lost in the same way when the 5k is started again, but just once.
I am running NX OS version 5.2.1N1.3.
I have no idea what could cause this behavior.
Any help would be appreciated.
Regards,
Bogdan

Hi Reza,
Below you can find my run-config.
version 5.2(1)N1(3)
feature fcoe
install feature-set virtualization
feature-set virtualization
logging level feature-mgr 0
hostname N5k_1
feature npiv
feature telnet
cfs eth distribute
feature udld
feature interface-vlan
feature lacp
feature vpc
feature lldp
feature vtp
feature fex
fex 107
  pinning max-links 1
  description "FEX0107"
  fcoe
fex 108
  pinning max-links 1
  description "FEX0108"
slot 1
  port 31-32 type fc
vpc domain 1
  role priority 1000
  peer-keepalive destination 1.1.1.2
  auto-recovery
vsan database
  vsan 50 name "VSAN_A"
fcdomain fcid database
interface port-channel100
  description Po Synch N5k
  switchport mode trunk
  spanning-tree port type network
  logging event port link-status
  logging event port trunk-status
  speed 10000
  vpc peer-link
interface port-channel107
  switchport mode fex-fabric
  fex associate 107
  vpc 107
interface port-channel108
  switchport mode fex-fabric
  fex associate 108
  vpc 108
interface port-channel111
  switchport mode trunk
interface vfc111
  bind interface Ethernet107/1/1
  no shutdown
vsan database
  vsan 50 interface vfc111
  vsan 50 interface fc1/31
  vsan 50 interface fc1/32
interface fc1/31
  no shutdown
interface fc1/32
  no shutdown
interface Ethernet1/1
  description Synch N5k
  switchport mode trunk
  logging event port link-status
  logging event port trunk-status
  udld aggressive
  channel-group 100 mode active
interface Ethernet1/2
  description Synch N5k
  switchport mode trunk
  logging event port link-status
  logging event port trunk-status
  udld aggressive
  channel-group 100 mode active
interface Ethernet1/3
  description Synch N5k
  switchport mode trunk
  logging event port link-status
  logging event port trunk-status
  udld aggressive
  channel-group 100 mode active
interface Ethernet1/4
  description Synch N5k
  switchport mode trunk
  logging event port link-status
  logging event port trunk-status
  udld aggressive
  channel-group 100 mode active
interface Ethernet1/5
  switchport mode fex-fabric
  fex associate 107
  channel-group 107
interface Ethernet1/6
  switchport mode fex-fabric
  fex associate 107
  channel-group 107
interface Ethernet1/7
  switchport mode fex-fabric
  fex associate 108
  channel-group 108
interface Ethernet1/8
  switchport mode fex-fabric
  fex associate 108
  channel-group 108
interface Ethernet107/1/1
  switchport mode trunk
  channel-group 111 mode active
interface Ethernet108/1/1
  switchport mode trunk
  channel-group 111 mode active
version 5.2(1)N1(3)
feature fcoe
install feature-set virtualization
feature-set virtualization
logging level feature-mgr 0
hostname N5k_2
feature npiv
feature telnet
cfs eth distribute
feature udld
feature interface-vlan
feature lacp
feature vpc
feature lldp
feature vtp
feature fex
fex 107
  pinning max-links 1
  description "FEX0107"
fex 108
  pinning max-links 1
  description "FEX0108"
  fcoe
slot 1
  port 31-32 type fc
vpc domain 1
  role priority 1000
  peer-keepalive destination 1.1.1.1
  auto-recovery
vsan database
  vsan 51 name "VSAN_B"
fcdomain fcid database
interface port-channel100
  description Po Synch N5k
  switchport mode trunk
  spanning-tree port type network
  logging event port link-status
  logging event port trunk-status
  speed 10000
  vpc peer-link
interface port-channel107
  switchport mode fex-fabric
  fex associate 107
  vpc 107
interface port-channel108
  switchport mode fex-fabric
  fex associate 108
  vpc 108
interface port-channel111
  switchport mode trunk
interface vfc111
  bind interface Ethernet108/1/1
  no shutdown
vsan database
  vsan 51 interface vfc111
  vsan 51 interface fc1/31
  vsan 51 interface fc1/32
interface fc1/31
  no shutdown
interface fc1/32
  no shutdown
interface Ethernet1/1
  description Synch N5k
  switchport mode trunk
  logging event port link-status
  logging event port trunk-status
  udld aggressive
  channel-group 100 mode active
interface Ethernet1/2
  description Synch N5k
  switchport mode trunk
  logging event port link-status
  logging event port trunk-status
  udld aggressive
  channel-group 100 mode active
interface Ethernet1/3
  description Synch N5k
  switchport mode trunk
  logging event port link-status
  logging event port trunk-status
  udld aggressive
  channel-group 100 mode active
interface Ethernet1/4
  description Synch N5k
  switchport mode trunk
  logging event port link-status
  logging event port trunk-status
  udld aggressive
  channel-group 100 mode active
interface Ethernet1/5
  switchport mode fex-fabric
  fex associate 107
  channel-group 107
interface Ethernet1/6
  switchport mode fex-fabric
  fex associate 107
  channel-group 107
interface Ethernet1/7
  switchport mode fex-fabric
  fex associate 108
  channel-group 108
interface Ethernet1/8
  switchport mode fex-fabric
  fex associate 108
  channel-group 108
interface Ethernet107/1/1
  switchport mode trunk
  channel-group 111 mode active
interface Ethernet108/1/1
  switchport mode trunk
  channel-group 111 mode active

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