Guys,
I'm running a 720  on Version 8.2.50 connected to a TruTrak autopilot.  Usually, it works perfect.  Lately however, I've noticed that over the course of say,, a 1 hr. trip, I'll be flying along and out of nowhere, the airplane takes a left or right turn.  It will usually get me about 5 or 10 degrees off heading, then go back to the original course to my destination.  There's no indication of a GPS signal drop and I have it coupled to the ADSB antenna as well.  Ultimately, it will re-intercept and continue on.  Usually, this occurrs no more than twice on a 1 hr. trip.  Any ideas?  By the way, it's done this on the last two previous version of iFly software as well.  I'm also running a Skyguard ADSB Tranceiver.  Could cell phone Bluetooth cause this?  I'll make sure thats disabled on my next trip to rule that out.
Chad