For the last few weeks, Chrome 77 breaks very badly when there are more than 255 failed websocket attempts: https://bugs.chromium.org/p/chromium/issues/detail?id=100624... Even refreshing the page doesn't workaround the problem (you have to open a new tab). This has been causing a lot of trouble for long running single page applications that use websockets. Fortunately, a fix is being rolled out right now for Chrome. We've also been getting reports of this other websocket connection issue breaking SPA's.