"Blizzard Agent went to sleep" happens whenever I do this

It seems that whenever I close out of Hearthstone on my computer and then go to play Hearthstone on my phone, then whenever I try to open back up and log into the Desktop App, it gets stuck on the “Blizzard Agent went to sleep. Attempting to wake it up”. It’s fixed whenever I restart my computer, but I thought it was strange how if I go from my computer, to Hearthstone on my phone (iPhone 6s if that’s relevant), and then try going back to the Blizzard app on my computer, this always happens.