If you notice flickering when using the V350, then you'll need to perform a test on the equipment. To do so, you need to place the outdoor panel next to the monitor.
To connect it, you can use two 0.5mm² wires. A short length is sufficient for this test (less than one meter).
If the crackling stops, it's a local problem. Verify the following:
For other cases and if the equipment continues with this error, contact Somfy's consumer service.