Your electronics are usually powered by your cranking battery. I added an 1199 this year and eventually my big motor. (150hp) failed to start on 2 occasions when I had been on the water for 7-8 hours. I replaced my starting battery and resolved the problem.
You could have your cranking battery tested under a load at an auto parts store to determine if it is weak. Sometimes batteries will fully charge but the charge they hold is reduced due to sulfation of the lead plates.