Why does T23G randomly negotiate 100Mb half duplex

[complex1]

(02-25-2017 02:50 AM)avayax Wrote:  What adverse consequences would I have to expect if I hard code 1000Mb full duplex into the Yealink?

None, I think.
But there must be a reason why the phone change automatically between half and full duplex.

Please try next:
Checked the network cable (>cat5e)?
Connect the phone to a other port on the switch or, and preferable, us a other switch?
Hard code the dedicated switch port instead of the phone to 1000Mbps Full?