Hi,
I hope you are keeping ALL the mains AC power wires away from the controller PCB?
The other thing that has me worried is the thick tracks that run over the thinner controller tracks.
If those tracks are carrying current they could cause interference to the controller.
Have you got 220Vac mains on that PCB, if so where and how have you made sure it is isolated from the low voltage circuitry?
Is BR2 on the PCB the mains rectifier to give the zero crossing signal?
If so the mains track winds amongst other tracks, not good and could be also causing your problems.
Tom... 
