I'll add, has your FJR had the ground harness recall done? Your mix of symptoms could be a loose battery connection as mentioned but could also be a connector corrosion problem or a loose connector on the ECU, especially if someone did the Barbarian Jumper modification to the ECU connector and didn't latch the connector back in place. Another item that controls main power is the ignition switch which also has a recall. The ABS light is the odd duck, the other symptoms could be attributed to the ECU but to have the ABS light at the same time points to something other than the ECU or ABS systems.