2016 Honda Crv

Hi,
I purchased a Honda CR-V touring with 12,000
miles in June. I noticed that the a/c and seat
heaters did not seem to get very cold or warm, the
outside temperature gauge was not giving correct
temp, the pandora button on the radio when
pressed would completely cause the radio to shut
off and restart. Appx 2 weeks after that the rpms
while driving at a steady speed will shoot up or
down 500 rpms. 2 weeks after that the battery
completely died, purchased a new battery next
morning it was completely dead. Charged it for 12
hours took it to the dealership they couldn’t find
anything. Since the 12 hour charge appx 2 weeks
the car worked like a champ, no idle issues, a/c
freezing etc. Now this morning the rpm issue has
started again! Sounds electrical to
Me but I’m not a expert.