This might be related to the bug from a year ago where taking damage did the same thing. Each time one of your mining beams completes a cycle and adds a crate of ore to your ship's inventory, the game client locks up momentarily.

Seems to be worse on slower devices (phone, tablet) and on characters with larger inventories.

If you're running > 3 beams on a cool asteroid, the effect is very disruptive and makes it hard to control your ship.

Is it possible to similarly cache the local ship's cargo to keep your character's entire inventory from updating while mining?

Was this using Wi-Fi or Mobile network?

Both. It's got nothing to do with the network. The game client itself hangs.

The next client update will resolve this issue.