My Philips Avent baby monitor's screen is buzzing/flickering
Interference may occur when the parent unit and baby unit are too far away. Move the units closer to each other.
Interference may also occur if there are too many walls or ceilings between the parent unit and the baby unit or when other 2,4 GHz wireless devices are switched on (e.g. DECT phone, microwave, wireless devices). Put the parent unit in a different place, closer to the baby unit, or switch off other wireless devices.
The rechargeable battery of the parent unit may be low. Recharge the battery.