I nearly got the same issue since some weeks now (before it ran fine) and today I've seem to found the issue ... my WiFi !
I use both a 2,4Ghz and 5Ghz WiFi at home and even if it "seems" to connect fine, there seems to be packet loss and the A600GS is getting kinda stuck in the boot process, maybe while trying to set the connection up. So I disabled the WiFi from the main menu and it´s booting fine every time ! Then I setup a hotspot and put the phone next to the A600GS, connected it to the hotspot and it boots fine every time as well !
Don´t know if this applies to you as well but you can at least test it anyway
