Might be really simple like a battery terminal connector is loose. Check the connectors are tight.. if not tighten the clamps. If the terminal connector is loose you may find that you also have difficulty in starting. If terminal connectors are on tight but still have the issue then check the connections to the alternator (clean and tight) and likewise the earth return strap between the engine to the car frame. If you have access to a voltmeter the battery, with the engine off should read 12.4 volts between the terminals and 14.4 volts when the engine is running.
It does sound like the alternator isn't working. Did you have to jump the vehicle or charge the battery to get it to start back up? If you did not have to do either the possibility of the alternator working is good. The car will run with less power in the battery then what it takes to start the car. If you did not have to jump or charge battery to get it started again you might be better of checking for loose or corroded connections and most likely a maim power cable or wire. A bad diode in the alternator can also cause what you described due to the alternator putting out an AC current the computers and electrical components won't work right they were built to handle DC current. If you don't have the proper test equipment to test for AC current just disconnect the alternator while the car is acting up and if ever thing goes back to normal you will know it is the alternator. You are going to need at least a volt meter. The voltage while the engine is running should be 14 to 14.8 volts.
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