MKIRO

Some grading tests with Kinoluts I did over the last few weeks. Also this is my first post here and im also inquiring about a little issue. My GH4 tends to randomly display the "Lens attachment failed" error. This often happens during zooming in and out. I already tried to clean the contacts, but that didnt help either. Anybody had such issues before? I'm really trying to avoid sending the unit in for refurbishment. I hope there's another solution for this.