internal server error

I keep getting “Internal Server Error” no matter what transaction I try.

I initially tried “Classic Mode” and it worked for a few months then kept getting server errors, and now I tried “Autopay Mode” praying that it would resolve the issues, but it is also giving me errors. I tested with all plugins shut off and did the standard trouble-shooting.

Any insight you could offer would be great.

Been trying to figure this out for months on my own so I wouldn’t have to wait for customer support response.