TCP DUP ACK Flooding

Hello,

Wondering if anyone might have an idea or suggestion here.
Lately we’ve started seeing some large ammount of flooding on our network which lasts usually about 1-5 minutes and happens randomly, sometimes every few minutes or hours.

When I packet sniff the network I see that it’s not always the same IP source or destination when the flooding is happening. What I see in the logs are large ammounts of TCP DUP ACK packets going from some ip to another ip (this pair of ip’s doesn’t change throughout a single flood)

I am totally out of ideas on this one.
Thanks for any suggestions.