Thank you for contacting us.
Could you confirm which dimmer receiver you are making use of, is it the LED or the halogen dimmer? and what is the load you are switching?
Do you notice this only when you switch the load on or is it also when it dims off?
If you switch the load on and then DIM it to a certain point i..e 50%, do you see the same problem?
Are there any extractor fans on this circuit we need to be aware of?
Look forward to hearing back from you.
Kind regards;