Just popping an extra tank on top seemed to give it useful range. But I'll try this new one. Thanks

This is an old design, for more a quarry miner with more cargo space and range (hydrogen tanks), try the Myxini Quarry Miner MK2-HO 1400, it is in the same collection.

Not enough hydrogen storage, burns too quickly on a planet or moon (which due to it being a vertical configuration this is designed for).

There is a piping issue on this build.

The ejectors are set to collect all, and throw out, but they are connected to the Connector as well as the sorter, this can result in items from the Base/Ship the QM is connected to being ejected accidentally.

Haven't checked the QM2-I or QM2-A but the pictures look like they may have a similar issue.
Can be compounded with PAM running as PAM tends to leave the ejectors alone, and just toggle the Sorters.