the problem is ccu connected in lan with fritzbox 7590 , unitl yesterday i was on 6.84 firmware and no have Crackling, all work well, after update 7.21 the Crackling is begin, only in lan, in wifi no...
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the problem is ccu connected in lan with fritzbox 7590 , unitl yesterday i was on 6.84 firmware and no have Crackling, all work well, after update 7.21 the Crackling is begin, only in lan, in wifi no have problem. now have to downfrade fritzbox or try preview program with ccu