Like I said,can be quite elusive,these come,and,go problems.Amountain of good advice in these threads.What its all boiling down to though is YOU have to "systematicaly"track down the source of the trouble.DON`T go willy ,nilly about this,verify everything and leave no doubts about any of the components either by replacement with known"good"parts,or having a certified electronics shop QUALIFYING your entire electrical system to be functional and proper.Just be professional about this and leave 0 possiblities of a remaining problem!! My school of HARD knocks lesson for the day!! Sometimes the $1.50 savings on lesser quality parts is NO saving at all.You`ll realize this,as you`re picking up the splinters on the ground that used to be a really nice plane!!Or worse case scenario,when your in court because tha plane hit or KILLED someone!!!This hobby is fun but can be deadly,and it has happened too..Bottom line don`t test by hoping,you`ve got the source of the problem figured out,and then,"flight"testing to find out you were wrong again.It`ll cost you every single time you realize you still got a glitch.Don`t want to be a downer,just trying to keep you playin`HOOKIE from that"school", ya really,really,don`t want to go there!!! By the way,could the antenae be touching metal when the plane gets inverted? But that usually causes some twitching for a second,not,total loss of control.Sometimes can be that simple[X(] Well good luck to ya!! FLY forNOW!!!!! DAVE B.