The only way would be to use an IP power switch, such as from Wemo.
However, I would try to solve the cause of the problem, rather than solving it with a work-around.
I would say that something in your network is blocking this. What does your RRC's status page say
after the problem occurs? What UDP ports are you using? Is SIP ALG turned on in one of the routers?
73,
Mitch DJ0QN / K7DX