Powerline network drops w/ speaker static

Hello everyone

I have a problem involving my panasonic HD-PLC BL-PA-100 powerline network adapter. I currently use it to get internet access in my room since the wireless signal is having problems going upstairs and through walls. For the last month or so, mainly at night, my speakers will start to get staticy and then shortly after my connection will drop, this happens for about 3-5 mins. I cannot find a common factor in the house for this problem. I corrected a previous problem with an energy saver bulb in the basement causing problems, but since then (3+ months) I have had none until now. I think it must be something in the neighborhood causing it but cant think what. After the static passes, I can connect again. Any suggestions or theories about the cause would be greatly appreciated. Thank you