With some great help from Fastly’s @cjackel we found that this issue only concerns KPN users that use the Primary DNS: 195.121.1.34, Secondary DNS: 195.121.1.66 numbers. It keeps working in all browsers but Chrome. Clearing caches and host cache does not help but if you switch to the google DNS Chrome works again fine with this forum. Perhaps it is just a strange DNS wave only effecting Chrome?