Hi, nice looking clock. I have a similar looking one, although with 2 barrels, being repaired and serviced at the moment. I'm not an expert but is sounds like something to do with the escapement is broken.
What I can say is that, not knowing what you paid for yours, they aren't hugely valuable, maybe £130 for a working one. It's probably going to cost at least £100 to have it repaired, more if parts have to be made. Maybe an expert has a better alternative though.
Mine has sentimental value so I'm very happy with what I'm paying to have it repaired, but if you haven't fallen in love with yours yet maybe worth sending it back.
Nice thing though, lovely dial (watch out for the radium).