Our 2001 Toyota Prius hybrid would stop a few minutes after the red warning triangle light comes on.On the monitor,one can see that the main battery charging has stopped.When the engine is turned off and restarted the charging system begins to work again and after 10 minutes of idle running of the engine the car can drive again.This condition can occur a couple of times in a 30km journey even though the main battery has been replaced with new one 2months ago.

Please.what could be the possible causes of this condition and what are the soiutons?Thanks