Read and follow these best practice guides for Zigbee interference avoidance and setup optimization:
One of the main points there is that you really need to get any sources of EMF/EMI/RMI (electromagnetic interference) away from the Zigbee Coordinator radio adapter/module, and SSD harddrives and their USB cables are infamous for emitting EMF/EMI/RMI.
I would recommend that you at least buy a shielded drive enclosure as for the SSD harddrive as well as a long shielded USB extension cable for it. Though an easier and better solution is probably just to buy and migrate a new Zigbee Coordinator USB adapter and put it on a ong shielded USB extension cable to a USB 2.0 port (or best connect via a powered USB 2.0 hub as then you secure the power too).
https://skyconnect.home-assistant.io/zigbee-migration-selection/