I have a strange situation, on a tower we have CMM micro and 3 BH 10 link, all these were on 10 half duplex due to the interference on the tower, we used STP cable but still could not go to 100, as it would crash in the morning.
after running for few months, the speed got really slow on the BH links. it was only doing 6KB/s transfer. When we changed teh link speed to 100 / Auto, the speed went to 450KB/s.
Anything we are missing ! as we cannot run with 100, due to interference on the tower !
try swapping the CMM