Happened to me the day I picked up the bike several times. It means the voltge is low and the radio will automatically be shut down. I checked my battery with a volt meter and found it was low. i think it was below 12 volts. A helathy 12 volt battery should be above 12 volts while the bike is off.
Dealer never juiced it up I suspect.
Anyway, put it on the Battery Tender and it came up to snuff. It held a charge over 12 volts (12.9-12.7) for the week while it sat in a cold garage. Then I ran it again and no problems, no low voltage warnings.
After my ride (with a heated vest on) it was still close to 13 volts. So, in my case it looks like the battery was never charged up after sitting for months. Hopefully, yours is the same. Also, check the output coming from the alternator as one person had a total failure and several had bad batteries from the outset.
Start by charging it up!
Oh, i was told a long time ago (i dont know if it still holds true consdeiring todays charging systems and improved batteries) that a partially depleted battery will never really be brought up to a proper full charge on the bikes alternator alone. the Bettery Tender or something similar is a good place to start.