I installed a 4 pack of these P100 Smart plugs.  Easy to set up, compact and efficient.  All were used for scheduling lights.  It took me several months to realise that it was when the outside lights came on in the evening that my wifi became totally unstable and throws off the connections of other devices that have been connected and working all day.  Could be that the offending devices are fairly remote (garage and a shed), but that should not matter, why should the schedule/on status affect my whole router stability? Firmware etc was upgraded. I have with regret returned to mechanical timers, since i disconnected the Tapo devices everything is stable once more. ANyone else had this problem?