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DL3 collage and sdi input.

I am currently running (6) DL3's in a 3x2 enhanced collage. I am also using the SDI input to the fixture to map a feed from our video rig through the collage. Most of the time all is fine and dandy, but after about 20-25 minutes of ingest the DL's lose sync with each other. It starts out small (1-3 frames) then gets further and further off (give or take 2-3 sec.). The stock content seems to stay mostly in sync during all of this, as we switch from DL content to the SDI input. The only thing that seems to "re-sync" them is a reboot from CMA. So I was wondering if anyone had any ideas as to how to correct this.

All of the DL's are running v1.3.7.1382. I was wondering if this may be addressed in v1.4.0.1699. Just haven't been able to drop the truss yet to upload the update.
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    Our SDI source is from a GrassValley Indigo HR outputting SD-SDI (SMPTE 259M) directly into the DL3s over RG59 cable. Then the SDI signal is looped thru the fixtures.
    On a side note. The original lag is while the fixtures in a 3x2 collage. We tried playing with the DL's in a non-collage situation (6 separate images not one big one). The SDI seems to stay in sync. Haven't had a chance to yet to test the sync over a long period of time yet (only 5-6 minutes so far).
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    Our SDI source is from a GrassValley Indigo HR outputting SD-SDI (SMPTE 259M) directly into the DL3s over RG59 cable. Then the SDI signal is looped thru the fixtures.
    On a side note. The original lag is while the fixtures in a 3x2 collage. We tried playing with the DL's in a non-collage situation (6 separate images not one big one). The SDI seems to stay in sync. Haven't had a chance to yet to test the sync over a long period of time yet (only 5-6 minutes so far).
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