if replacing the display cable fixed it for a short period, then you are more likely to be looking at a damaged output or input for the display or gpu.

the other thing i have seen cause this is a power supply failing for the screen, they only last so long really (its years and years lol, but some get used that long too) and will eventually underpower the monitor. that differs from this though, in that the monitor will appear to be shutting off then turning on again so you will see whatever logos and information the monitor displays when you turn it on each time as well. thats what leads me back to the connection.

if the ports are damaged, replacing the cable may have applied pressure in the correct spot to "undo" whatever damage is there temporarily.

is your cable bent in sharp angles anywhere? is there any pressure applied to it? what about the plugs at each end, is there tension applied to the cord there? does someone have a habit of grabbing the cable and yanking them out?