Did u ever find a solution for this?? I am having the EXACT same problem!
The only thing I have found to get it to work is turn off my wifi then turn it back on.
I think what is happening is Lightroom disconnects from wifi when my phone goes to sleep and it doesn't reconnect.
Check that you have 'Prevent From Sleep' enables in the Lr settings on your device.
That prevents your device from sleeping while connected to charge during a sync session.
Just started the Failure to load development error. I have been using a Samsung Galaxy tab A and LR CC for months just fine. I do not a Prevent From Sleep choice in settings. I cannot import new images into LR CC either. Any help appreciated.