I'm a bit dumbfounded that this could be happening in this day and age.
Maybe (hopefully?) I'm missing something but a team of above average Cisco or Network+ certified engineers eat problems like "bad network chip" for breakfast. Toss the boxes with the bad chip? A depot-level chip replacement ? I assume it is likely complicated by a bespoke space network protocol and chip but there are manuals the Geek Squad A-team could refer to, right?
...The report also finds that the Gateway program is running into some pretty serious technical difficulties. One involves a defective network chip that facilitates communication throughout the lunar space station. Its failure could cause myriad problems onboard the Gateway.
"For example, these defects could lead the flight computers to unexpectedly restart," the report states. "If the network is not functioning properly, it could result in loss of control of the Gateway. Program officials are also concerned that they might identify more defects with the communication network, based on the number found already."...
https://arstechnica.com/space/2024/08/nasas-lunar-gateway-has-a-big-visiting-vehicles-problem/