Hi and welcome to these forums
Because it is all the way to the end of the progression bar it looks like the mixer is trying to load corrupted user settings.
When you switch off the mixer do you use the power down option from the Home menu first? This option ensures that the present settings are stable and completely saved before you switch off the mixer. Switching off without using this option can cause the mixer to save incomplete settings and, well, do what you have now.
Try switching on the mixer whilst holding the FX button. This will clear out all user settings and should allow the mixer to start up clean. Pity if you haven’t saved your scenes and settings in UC / UC Surface but that can’t be helped now.
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