lionelmaster hudson chuffing problems

My lionemaster hudson’s tender has been acting up. It only chuggs on streight track. when it gets to a curve it stop chugging and starts agin when it get back to stright. Help!

Sounds like something isn’t getting any electrical contact, Sorry but I wouldn’t know where to begin… did you contact lionel?

If it has a tether, I would bet the tether is bad. TAS has replacements.