Increasingly, whenever I open the node-RED editor (v0.20.5) the editor page opens fine, but the flows are missing, and I have a blank workspace as per the screenshot below.
Quite often reloading the page (F5) restores the flows, but sometimes takes several attempts.
There are no issues reported in NR log, however using browser tools, I am seeing
Failed to load resource: net::ERR_SPDY_PROTOCOL_ERROR 200
A google check of that error offers a number of solutions, clearing the browser cache (which helps for a while), flushing the sockets, etc, which don't appear to make much difference.
Browser - Chrome Version 74.0.3729.131 (Official Build) (64-bit).
Node-RED running on RasPi 3b+, and served https via cloudflare.
Any suggestions please.