I’d say check your tensioner Sharkie, it’s very easy in longitudinal drivetrains. There were 4 revisions of the same tensioner, how can be one sure that there won’t be the fifth one? The tensioner in my son in law RS Octavia failed @ 140,000km. The chain driven engines timing components should last the life of the engine, which should be at least 250,000km for well designed and built engine. The timing belt would last longer than that.