Hi there.
Got the same thing with my01v96, and a kind of interesting sideeffect. I think it has to do with a kind of midi feedbackloop in the midiox for my part. When I reconfigured the in and out ports in midiox I haven't had that problem anymore. that is the send and recieve ports has to be seperated(In a synth you use the "local" control so that the midi is send to your out port to, and then returned from cubase and it sounds often with a little delay, but you actually disconnected the directline internally in the synth so you don´t hear it, if you don't use "local" you get a annoying metal kind of sound out of your gear.) . So If you wifi sends back to itself at the same time it sends to cubase and then the signal from cubase gets in with a little delay... well problems... Hmm, do U have midithru somewere in the computer that make this happen.
Hope it makes sence..