Weird, Random 502 Error & Pricing Tier Query

I’m on the free plan and seeing intermittent 502 errors (~30% of requests fail). My service is a Node.js Express app. These errors occur even with low load. I’ve checked logs but nothing stands out.

Also, it seems like the starter plan has been discontinued, as I only see plans starting at $19. What can I do when I don’t need all of that resource for the Professional plan? It’s a small project right now.