We have been having the same problem. The problems started after an update before the rise of iron expansion. Before then there was no problem to connect 3 playstations, 2 wifi and 1 wired. Now we need all wired just to have a chance but it doesn't always work. We also try hard resetting the PS4 and the routers to get it to work, and it does usually, but it's more convenient to use wifi....we have plenty of band width with fibre optic broadband and it all worked just fine a few months ago.mvery frustrating problem.
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