This track was too bumpy for the cars in general! I went totally stock with the set up and it was fine!I had the random bump thing again in the race - much earlier in the race this time, though. Never had it once in practice, so no way to be prepared for it.
Probably wasting my time doing these races until they fix it, 2 DNFs in a row now due to it. And I know people will say it's probably setup related, BUT if I don't experience it once in practice, there's no way to fix it before the race.