rob aylestone
Moderator
If it's coming through the mainspring then the click and regular space could indicate something is charging, then discharging = suspect the horrible wall wart power supplies - it could be a failed capacitor charging and then arcing over and putting a spike onto the mains - that permeates through the property.
The only way here is to switch every single charger/PSU off and reconnect one by one. You need to be methodical.
The only way here is to switch every single charger/PSU off and reconnect one by one. You need to be methodical.