I used to own the WGR614 but found the router to be unreliable and unstable. I subsequently replaced the unit with a DIR-615 a little over a year ago and haven't had any issues since.
My only suggestion (and I'm grasping at straws here) is if the router is fairly old, newer firmware may help. You can read the firmware release history on the Netgear website to see if there were any relevant changes that may impact DCS performance.
** Disclaimer: updating the router firmware can cause network instability and shouldn't be attempted if the router is working properly and isn't giving you problems **
If you update the firmware, remember to go into the router GUI (Maintenance -> Backup Settings) and save a settings file to our desktop before updating so you can quickly restore everything.