This issue affected me as soon as I upgraded my chrome to V54 yesterday. It broke all my CDN hosted files which were using the AlphaSSL Wildcard certificate. We were experiencing low traffic and realized this may have been the issue. Got into Chat support with ssl2buy who provided me with a Comodo Wildcard certificate. It was a pain to recreate and install the certs everywhere. But we didn't want to lose any more traffic.