The OCSP server suggests trying again later. Error code: ERROR_OCSP_TRY_SERVER_LATER

I keep get this error only on firefox:
Secure Connection Failed
An error occurred during a connection to tamfitronics.com. The OCSP server suggests trying again later. Error code: SEC_ERROR_OCSP_TRY_SERVER_LATER

The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
Please contact the web site owners to inform them of this problem.

Every other browser, Microsoft Edge, Opera, Chrome.
Also, Microsoft Internet Explorer is broken on the home page ans broken CSS on other pages.
Note this issue is only for https://www.tamfitronics.com/ and https://www.tamfitronics.com/shopfinish

Tistalents (https://tistalents.com) for now loads fine on all browsers except Microsoft Internet Explorer
From communities, OCSP is referred to be from the web server, to be disabled, as it is a bug form Apache 2.4

Please help.
It also does the same thing on Firefox Mobile.

Warm Regards