Please provide the following information:

1) config file

2) Details of Mitel phone used

3) Number of PD devices (phone or others) connected to device

4) Output of show power inline command before and while issue happens

5) What was previous version used which did not have a problem?

6) happens every 3 days - is there any special event or occurrence in network at this time?

7) More details on which certain phones disconnect and which do not?

8) Are you using a EPS?

Were you able to get any of the above information?