i have a tps5000 hooked up with device net to krc2. but i don't use kuka software or a kuka teach pendant so i don't know how much help i can be.
however, i do have problems once in a while which requires me to swap out the devicenet terminals. when i do that it works for several months and then it messes up and i swap the old ones back in and it works again for several months.
i'm not sure why. i ruled out loose connections. i think that it gets an over current or something. the enviroment is fairly clean.