I have some troubles to access to my shadow on my iPad with 4g pairing iPhone.
I use Shadow Boost to work and not to play in this configuration. So, I didn’t need high bandwidth in this case.
On my iPad Air 2 + Wifi → No problem (and particularly useful for working on my novels and my blog posts)
On my iPhone + 4G → No problem (only for eyes )
On iPad + 4G trough iPhone → error R:108
Is there some configuration tweaks to get rid off this error?