I need some assistance here from the more technically inclined.
My trusty Lionel Metro North M7 (the original RTR, not the new Lion Chief set) powered cab car has decided to start derailing virtually every time it starts to negotiate a curve . It did this on my club layout’s Atlas O-72 and O-81 curves last week, and then proceeded to do the same jumping off the rails on my O-31 Real Trax Christmas layout this past week so the action can’t be attributed to either the radius or the track make. It’s got so irritating that I’ve resorted to running the train in reverse (as seen on my YouTube video) just so I can see it run at length . The derailing only happens when the powered cab car is leading, not trailing. I miraculously got it to run normal on the Christmas 31x80 layout for about 2 minutes (luckily capturing it on video) but otherwise it jumps the track entering the curve on the near end or the far corner which are lot more fun. There are no such issues leaving the corners for the straights.
I tried running it at both slow and fast speeds, figuring the fast speed would lessen the chance of a derailment but that isn’t the case, it's actually the opposite effect. Help!