I got a new CSS326-24G-2S+RM. Its getting FCS and MAC errors on every port thats connected. I received it at swos 2.7 and I upgraded it to 2.9 and the issues persisted. I have already checked the ground, enabled/disabled flow control on both ends, new cat6 patch cables, and checked mtu size. It seems like the old firmware is much more stable and has less errors. Anything 2.8 and newer is basically unusable. traffic flows in the older firmware. Is there anything else I can try besides sending it back?