Shared line sometimes does not ring on some phones

I'm having a strange issue that appeared a couple of weeks ago.  I have not made any upgrades since October so I don't think that's the issue.  I'm running CUCM 8.5.1.15900-4.
The issue is that one of my phone's shared line appearance does not ring while the others are ringing.  It seems like that phone is omitted from the broadcast sometimes.  This doesn't happen all the time.  Most of the time, all the phones with the shared line appearance will ring.  I'm not sure if it is only happening on this phone.  It is very hard to reproduce.
Has anyone had this issue?  What are some debugs I can collect to show what physical phones CUCM is ringing when the calls are coming in.  I want to confirm that it is omitting that particular phone.
Vince

Hi Jeff,
I never went as far as to open a TAC case.
Most things I tried have corrected the issue temporarily (resetting the DN in CUCM, resetting the phones, upgrading firmware). I acutally upgraded CUCM from 8.6 to 9.1.2 just under a year ago and haven't had the "ringing" issue on the shared line since then. Not entirely sure if that was the reason though.
Since that upgrade I have other issues with this same shared line, most notably held calls not showing up on all the phones at intermittent times. 9 times out of 10 resetting the DN corrects this for about 6 months. That other 1 time, a reset via CUCM doesn't actually reset the phone and I either have to physically unplug power from the phone or do a shut/no shut on the switchport (effectively power cycling the phone).
I've created a job under bulk administration that resets the phones once a week (during closed hours). My thinking was these phones are like computers and need to be rebooted every now and again....

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