EMF from some source close the the Zigbee Cooridnator adapter and/or devices with issues? Is the Zigbee Coordinator plugged into a USB 2.0 port or via a USB 2.0 hub and not directly into a USB 3.x/4.x port, and not close to any USB 3.x/4.x devices or cables?
Follow-up questions is if you have enough “known good” Zigbee Router devices that are well placed in a location where they act as good Zigbee reperaters/extenders? Quick tip is to buy three or more ready-made dedicated known good" Zigbee Router devices and place them between your Zigbee Coordinator and all Zigbee devices that have issues. Better tip is to buy a few Zigbee Coordinator USB adapters, re-flash them with Zigbee Router firmware and use them as dedicated Zigbee Router devices by powering them with USB-changers, (hide them away so that no unplugs them).
Highly recommend that you read and try to follow all the tips here → Guide for Zigbee interference avoidance and network range/coverage optimization
Summery; Zigbee radios are extremely sensitive to almost all sources of EMF/EMI/RMI and Zigbee radios are very weak and by design rely on its Zigbee mesh (mesh networking) technology to relay messages and thus a stable Zigbee network need many “known good” Zigbee Router devices that are always connected/available.