Getting 505 error messages

[Leigh backs Brexit]

Never seen them before today. I've gotten at least 8 tonight.

 

[Robbie Hart]

Haven’t gotten one ever and don’t think I ever will

 

[Splinty]

Never seen them before today. I've gotten at least 8 tonight.

Where?

 

[Leigh backs Brexit]

Where?

I was starting a new thread and while typing the message all the sudden it flashed onto the screen. I clicked the "x" so I could go back to typing and it kept coming up again. When I was done typing I clicked on create thread and nothing happened.