D-100 heading problem

[Bellstef]

Good afternoon, five years ago has been installed EFIS D-100 and EMS D-120 on my TECNAM SIERRA P2002 RG. Lately on D-100 a recurrent problem is introduced: in flight the heading indicator continually moves him jerky of 5 or 10 degrees in comparison to the true course.
Can help me ?
Regards

 

[dynonsupport]

Has anything electrical (maybe strobe lights?) been installed near where the EDC-D10A compass module is installed? That sounds like it could be some kind of rhythmic electrical magnetic interference from an external device.

If NOTHING has changed in the aircraft configuration, give our tech support team a call at 425-402-0433 or an email at support at dynonavionics dot com.