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Check earth from battery to chassis and to gearbox. If the connections are dirty/corroded you will find funny things happening which you wount usually be able to predict. Turn everything on and drive again, if heater and wipers slow down i should think this is the problem. If these are fine, then the problems lies in the stereo and lighting circuits. Unlikely.
Also check link +ve between battery, starter and alternator. Again, corrosion will play havack with electrics, clean and grease connections, should be better then.
I have the same problem with my rear light, I think it is a dodgey earth because the rear indicator wont work some times and work other times, I will have to clean up the earth and see what happens. Any other suggestions?