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That can be for any number of reasons. Are you using any kind of adapter on the cord?
If the converter has never had an upgrade unit installed it can be starting to ground out and cause this. Disconnect it from the power source and see if the problem stops. If so, you have a good idea what is wrong. IF NOT, then the plug on the cord may be shorting out. Look for any signs of melted rubber around the prongs. Running an electric heater tend so cause this. Or using an extension cord and running the A/C. Hope that helps. I will be around all week-end if you need more. All follow ups are included in our fee.
Just checking back in to see if perhaps you missed my earlier response to your question or if not, do you still need some additional input from me here?