Yes, go into PingPlotter, add your router, and check for red lines. This would suggest a local problem. And yes, that would be things in your house, e.g. Wifi, router, cables, etc. You can use this guide to help you solve local problems: Solving Local Network Problems

Hard to say exactly what hop 2 is. I think it's more likely a device after your ONT, likely your ISP's border router. While it's possible that the ONT can have an IP address, they're typically configured as pass-through device. Here's a guide to help you build your case if it's in your ISP's network: Solving Problems Outside Your Network