I seem to now have achieved quite satisfactory performance over a three day period. Hanging the MRF upside down, without an antenna, and switching of my Bluetooth headset, cell phone, wireless AV distribution system and Pronto RF receiver might have done the trick. Serious limitation of functionality to have to unplug my AV distribution solution, and annoying to always have to switch of the cell phone, but it now seems to work at a usefull level.