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EW79A implies it's the original 10 speed Dura Ace with big multicore connectors and hardwired cables that's completely incompatible with everything newer. Are you sure?
Unplug one thing at a time until the problem goes away. Replace that thing. Or unplug everything, see if the problem still occurs, then re-add things until it reappears.
grams
Got an older external Di2 setup which now seems to discharge completely after a few hours. Any ideas why and moreover, how to diagnose? Shop with some connection wizardry, adding my wireless unit didn't work and the junction is EW79A so can't connect it to my own laptop?