With an intermittent problem, and one where you have wireless DMX, I think my next step would be to put cables to those units and see if it's really a problem with the app or a connectivity issue (more likely). I have a hard time believing that the app is the problem in that situation. One thing also, I have a couple of older scanners that simply don't work with this controller software. I see that as an issue with the device DMX itself, not the controller. I'd hardwire those devices to the box and test them out. Hope this helps.