A bit of a ramble…
Quite interesting thread, I noticed fairly recently that my breaker in the fuseboard sometimes trips when I turn all my gear on from one switch, in the past I never had any problems doing this.
I suspect some switched mode power supplies on my gear are causing the problem due to combined inrush current demand when switch is turned on.
BTW I have tested the combined draw of all my gear when powered on and it is 300w max (less than 2 amps at 220/240v) the breaker is rated at 32 amps.
I think the inrush current surge is causing unequal loading on the live and neutral lines causing the breaker to “err on the side of caution” and trip.
Right now I am just using a manual switch on the socket (very common in the UK but apparently not so common elsewhere) and occasionally I notice arcing inside the switch, obviously I am going to find a safer solution and to avoid the nuisance tripping of the breaker.
But, and this may be relevant to the OPs problem, previously I had been using remote control switches, these have a relay inside, I had a few different brands and all of them eventually failed. What I suspect had happened is that the relay(s) inside them had arced and either burnt the coil out or damaged the contacts.
It is pretty annoying and inconvenient to not be able to turn everything on from one switch, especially when dealing with the number of devices I have.
In the past when I had other gear or less gear using not using SM power supplies I never had such problems.
I need to do a bit of research to find a solution but I suspect that the culprit power supplies have saved literally a few cents/pence by omitting the thermistors on the mains input required to eliminate the problem, but this is only a theory.