Random Lync Phone Edition Disconnections - Sometimes does not sign back in

Question

We recently had a user who reported that his Lync Phone (Polycom CX600) was signed out when he came in first thing in the morning and it was sitting at a sign-in error page.  The phone then was having problems signing in.  We had to factory reset
the phone is order for it to get reconnected. 
After the user complained once again about a week later that he found he phone signed out, I had the local tech take a look at the phone.  She tells me it was then signed in.  Now i'm baffled.  The phone was signed out earlier but then decided
to sign itself back in and was working just fine.  One thing else to note, we replaced the phone with a brand new one and still had the same issues.
I checked the DBAnalyze logs with snooper and found several errors that concerned me.  Here is one of the errors I found:
Error Time
: 4/15/2013 10:46:19 PM
Call Id
: abcdef
From Tag
: def
To Tag
: abc
Error Code
: 0
Ms-diagnostic Id
: 52074
Request Type
: SIGNIN
Content Type
: application/xml
Error Diagnostic Header
: 52074;reason="Abnormal signout";source="";domain=""; peerServer=""; DiagCode="0"; HRESULT="0x80ee0088"; SignOutTime="2013-04-15T22-45-14Z"; SignInTime="2013-04-15T22-46-18Z"
Client version
: CPE/4.0.7577.4372 OC
Phone/4.0.7577.4372 (Microsoft
LyncPhoneEdition)
From User
: [email protected]
To User
: [email protected]
The part that concerns me is the "ABNORMAL SIGNOUT" message.  I found that this is happening to quite a few users around the company and quite frequently.  Has anyone else seen this issue before and if so, any clue as to what an abnormal
signout is?  Upper-management would like an explanation and i'm not quite sure how to explain it. 
Any thoughts?
John K. Boslooper Unified Communication Engineer

Answer 1

Thanks for responding Lisa. 
I don't see the exact events described in the KB Article that you sent but I do see some similar schannel errors that are not descript at all.
Log Name:      System
Source:        Schannel
Date:          4/19/2013 9:03:09 AM
Event ID:      36888
Task Category: None
Level:         Error
Keywords:     
User:          SYSTEM
Computer:      xxx.xxx.local
Description:
The following fatal alert was generated: 10. The internal error state is 1203.
Our certificates are provided by a 3rd party provider. 
I just had a user next to me a few minutes ago say that his phone disconnected and reconnected itself randomly.  I looked at the snooper logs and found an "ABNORMAL SIGNOUT" message for his account. 
I'm looking at a network hiccup or PoE issues right now, unless someone else has any other ideas?
John K. Boslooper Unified Communication Engineer