My name is Adam from the Blink Technical Support Team. I’m sorry to hear that you’re getting this error message. This message will occur when your Sync Module isn’t able to send the arm/disarm command to one or more of your cameras. Basically, when you arm/disarm your system, your Sync Module sends a message to each one of your cameras telling it what to do. If one camera doesn’t respond back saying it received the message, then it will send that error message, even though in the app, everything looked successful.
In this case, there are two things that you want to check to resolve the problem. First, check each one of your camera’s signal strength, both Camera to WiFi and Camera to Sync Module. You want to make sure that each one of your cameras has at least 3 bars of signal strength. If it’s less than 3 bars, there’s a chance of either constant or intermittent failures.
If you find that one of your cameras has less than 3 bars, either move your Sync Module closer to the camera, or move your camera closer to your Sync Module.
If all of your cameras have 3 bars of signal strength for both Camera to WiFi and Camera to Sync Module, it could be a power related issue. In that case, I’d test other commands, like Live View, just to make sure that the cameras otherwise functions properly.
If you still experience issues after verifying those two things, please submit a support ticket at support.blinkforhome.com. You can also feel free to give us a call at (781) 332-5465.