If you are connecting using the old school blue VGA connector then yes, you can have issues over time.
If your monitor and PC support other display connection types use those.
Basically digital rather than analog (VGA is analog, but most everything else is digital.)
Other options would be DVI and HDMI.
If your monitor uses VGA, then I will assume it's not new enough to support HDMI but will probably support DVI and if your PC has DVI support as well then use that.
It's possible that the cable you are using is going bad, but then again, it's also possible that the port on either the PC, the monitor or both are going bad and changing out the cable will do no good.
Honestly, DVI is better anyways, if you can do DVI then use that instead.
If switching over to DVI doesn't help, then either there is a problem with the monitor itself, or there's a problem with your graphics card (if you have one) or drivers for graphics.
At which point further troubleshooting and testing would be needed to determine and narrow down the actual cause of the issue.