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We found out a security device probing the network and was actually causing the problem. When we shut down the VLAN and to solve the problem at the time. We put it VLAN back on the trunk (months later) the issue hasn't returned.
Our issue was resolved by VLAN pruning. We had a VLAN that was bleeding over the trunk that wasn't being used on that switch. If the VLAN wasn't in use we removed it. The culprit was a scanning tool on the network that shouldn't have been scanning...
