Hi Clan,
Another thought that I have just had is in regard to the power source that you are using on your BB1. Is it Brennan power unit or other mains power unit (e.g. cell phone charger) or rechargeable batteries or alkaline batteries or ordinary batteries?
If using Brennan power unit, can you try another power unit (but make sure it is a 5 volt 2 amp unit, not 5 volt 1 amp which many cell phone chargers are)?
If you are using batteries, could you run for a while on the mains power unit and see if this makes any difference?
As an aside, when using ordinary/ alkaline/ NiMh batteries previously, I have watched the voltage indicator which starts off at about 6 volts when fresh, but this falls off quite quickly down to 4 volts (over a few hours). 4 volts is too low for a BB1 to work reliably and is probably not very good for the electronics.
I then purchased two sets of Lithium Polymer rechargeable batteries (Li-Po) while in the USA and these start off at 5.8 volts fully charged. After about 9.5 hours, the voltage is still up at 5.5 volts, then the batteries switch themselves off. This is designed into this type of battery. I reckon that this is much 'kinder' to the BB1's electronics.
Regards,
Peter.