The i226-V network card used in the Intel 700 series motherboard is defective
In fact, the i225-V in the past has been plagued by various problems. The connection is unstable under the 2.5Gbps network, and data loss or performance degradation may occur. However, it can be solved by forcing the connection at 1Gbps. The i226-V problem seems to be more troublesome this time, and there is no solution available for the time being.