Hi Richard, We got firmware version 11-5-1ES-13 from Cisco Support about a month ago to resolve our freezing/reboot issues on the phones. It appears to have resolved the issue for us. Hope this helps. Rob

Thank you very much!

Do you by chance have a link? I can't seem to find that anywhere. Or did you have to ask TAC for that?

Yup same issue here in our contact center. Most are using headsets. Running firmware 11-5-1-18. Anyone heard anything more on this? Thank you.