Motorola Dcx3400 Flashing Icon

i have a motorola dcx3400. any idea what this flashing lightning bolt icon is? it only shows when it's turned on. we had called shaw a few days ago with an issue and they reset it, got it working. but since then there is this flashing.

No, when batteries are low I get message on TV screen. I did google & found 2014 message stating this icon is for software update. Everywhere I search it sounds like updates are quick though & this is over 5 hours! Hoping someone from Verizon tells me this is normal or steps I can do to stop icon flashing on all 3 set boxes.

motorola dcx3400 flashing icon

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