T28 + 2 EXP39 (gray screnn and EXP lights turn off)

[condor]

Hi, i got problems with 1 phone T28 (2.72.0.30) and 2 EXP39.

1. phone randomly turns the screen gray, and does not allow to derive any calls or even answer, after a few seconds returns to work fine. (this phone receive call ALL the time)

2. the EXP39 randomly, but often the lights of the panels, then come back on, and the time off, and on again and sucecivamente off/on.

This what i did:

- Replaced the phone (HW)
- Replaced of all cables.
- Replaced power supplies.
- Monitor the network, result: 1ms with none packet lost.
- Check log, but i don't understand the warnings.

So, Where do you think that is the problem?

Thanks!

PS: I attach the recent log