Computer Help and Support

They have intermittent downtimes. That's all.
I have no idea why.

For that matter, Google/YT sometimes blocks access when "your computer is on a network with lots of suspect traffic"
They are all suspicious about bots and hacked home systems that are sending out bursts of requests (and you're on the same range of IP addresses)

And even DU has intermittent problems due to whatever cloud flare is doing besides defending against DDOS attacks (distributed denial of service)

I don't think it's more than this. Some sites are blocked for DMCA requests. But they bounce back after a while. with different domains.