I went off about 35 degrees to the left
By that I read that the aircraft changed track by that amount? Maybe that was due to proximity of the next waypoint? If you were 200nm from the next waypoint, it would make a much smaller adjustment.
If you meant that the wing dropped 35 degrees, then that's not unknown, not comfortable, but not that unusual. The autoflight system worked as designed.
It sounds to me as if you are quite inexperienced and have a lot to learn. Don't take that as a put-down, and feel free to ask more questions and put these events down as part of the learning process.