Have you tried changing to a different Zigbee channel after checking WiFi channels neighbor uses?
And did you try downgrading the firmware to latest 7.1.x.x or 7.3.x.x (as at least the 7.2.0.0 was known to be unstable, and the 7.4.x.x versions are still cutting-edge so not proven yet if stable enough for production).
FYI, the ZHA documentation has not been updated but it is now possible to change Zigbee channel (radio frequency range) from the ZHA UI/GUI interface and usually you will only need to re-pair sleepy devices (meaning normally just battery-powered devices and mains-powered products that are not Zigbee Router devices such as those that do not have neutral connected).
Important though is to first read and understand this article on (that was linked in the guide) as it covers what you should consider before changing the Zigbee channel:
PS: There is some more info on that ZHA UI interface option (not documented in ZHA docs) here :