Hi guys, I have posted before to this email list about an issue we have at customer site where direct Ethernet connections between wireless routers (1 x CPE and 1 x AP back to back) all of a sudden drop from full duplex to half duplex mode, even though they are hard set to 100M full. Previously I have considered POE injectors, cables, etc, but I have just had it happen on the weekend and again this morning at a different site. The common components between these sites are the Gigibit POE injector which comes with the Omnitik radios and the Omnitik radios themselves, at one site I have RB411's plugging into the back of the Omnitik and at the newer site I have SXT's plugging into the back of the Omnitik. So I have tried replacing POE injectors, cables, and also tried leaving the interfaces as auto-negotiate and hard setting them to 100M Full, but the original site still fails from time to time, the link goes to half duplex then at some random time after that just goes back to full duplex by itself. I can play around with the interfaces and get it back up and running normally but clearly I don't want to do that and aren't just able to jump onto the radio and do it at any time. Has anybody else experienced this problem with Omnitiks and if so is there a solution ? I am running ROS 6.19 on the latest problem unit and firmware 3.17. Any suggestions would be appreciated. Thanks Paul