This is the first I've heard of that failure on a SWM-16. The only way I know to reset is to pull the power on all your DVR's and SWM-16 for 30 sec., plug the SWM-16 back in and wait another 30 sec., then power all your receivers on one by one.
If that doesn't work, you can try to get DIRECTV to send you one but they will probably want to send a tech out under the protection plan.
If that doesn't work, you can try to get DIRECTV to send you one but they will probably want to send a tech out under the protection plan.