[lausbub]

I'm not 100% sure, but Reddit seems to shadowban accounts created from some IPs based on some reputation score. Perhaps malicious activity is occurring on your network due to malware?

[tomatotomato37]

May have also been unlucky enough to be reallocated someone else's toxic IP when his ISP changed his dynamic IP. That's happened to me a couple times

[boundchecked]

Could be, the sin of dynamic IP.