alt Hacker NewsTor guard nodes seemed to be under attack but the devs aren't really engaging with it publicly, at least. It happened to mine and I had to switch it to a middle relay. No problems now.
https://forum.torproject.org/t/tor-relays-shutting-down-my-4...
People say that even running a middle or guard node can get your IP blacklisted. I don't have personal experience of this because I don't use my home IP for regular use, just for selfhosting. All the other devices run on a network wide commercial VPN so if it did happen it wouldn't be an issue.
I'm having trouble differentiating the different "attacks" here. Based on your thread it sounds like you're getting a DDoS attack against your nodes. The article appears to show some level of sophisticated OS backdooring (possibly from the ISP being compromised). Are you also seeing attempts to backdoor your nodes?