Intermittent video/audio freezes with Quantum Client

Question

I upgraded to Quantum 2 weeks ago.   On my client, I am experiencing intermittent video/audio freezes that last about a second (rewind/replay is normal so it is not a problem with the source material).   I have experienced the problem with both live TV and recorded shows.   Sometimes we can watch an hour or more with no problems then there will be a cluster of 5 or more events, often within less then a minute of each other.   At first I though this was just an audio dropout, but now see it is a problem with both sound/audio -- no pixelation, no blackouts, just screen freezing or going very slow for a second or two.
At the suggestion of Verizon tech support, my connection to the client is all component and digital optical audio (I used to be HDMI for video, but because of my home theater needed to be digital optical for sound).
I have also noticed times where the response to the remote on both the client and server systems slows down with delays.   For example, when watching a show on the server, if I hit the quick (1 minute) rewind key -- I will see the server blink indicating it got the IR command, but nothing happens for 10 seconds or more.  In fact, if I hit the key several times, it will queue up the commands and do a long rewind 10 - 30 seconds after the first remote keypress.
Is this a media server problem?  On my latest call to tech support, they were suspecting a coax issue -- but rewiring my house is neither easy nor cheap.   Plus wouldn't a coax issue manifest problems all of the time as opposed to a quick series of problems in a 5 minute cluster an hour or so into a night's viewing.
I would prefer to keep Quantum; but I have not yet returned my original multi-room DVR setup (that worked fine) and need to determine if this can be fixed or should I just give up and return the Quantum boxes instead.
Any advice would be appreciated.
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Answer 1

I have actually had a very good experience with Verizon Technical Support.  On my last call, tier 2 support did a remote test of my cable connections and detected a problem.   A technican was then scheduled to come to my house.   The technican addressed 4 problems.
1.  The client boxes were sent to me without end-caps (signal terminators) for the coax out ports;
2.  The 4 way spliter needed to be replaced (the original was provided by Verizon);
3.  The fiber box was not properly grounded;  and
4.  We moved the cable modem next to the splitter putting it closer to the other units and bypassing a 50' cable run that may or may not have had problems.  -- Of course this last fix had me running cat5e cable to the office where the modem was, but so it goes.
Anyway, after those fixes, my droppout problem appears to have gone away.