@mbdmbd Same issue here - just had one beginning to stick. I think it's because the relatively light load (router, laptop, etc) has a high in-rush current when it's powered on (or quite inductive (unlikely) so causes a spark when it's turned off. Either way, the relay contacts eventually get partially welded together or at least stick together as a result. Tapping the plug hard will free it until the next time but it happens with increasing regularity once it starts.

I too have been looking for the/a part number to replace the relay (and/or a video) but to no end. Mind you the price of the relay erodes into the price of new plug anyway. Main problem is there's no indication unless you realise the load is still on! App thinks everything is fine :-(

However - I DID just find this https://youtu.be/P8cm8HFuG6s?t=11 So these MAY work https://tinyurl.com/259muo6a

  @Wibbly I think the difficulty is not in finding the part which is probably a generic relay, but in opening the plastic shell without damaging it. This is pretty annoying, as is the fact that they don't sell a module that wires can be connected to directly to control equipment that's permanently wired.

  @mbdmbd Actually, maybe I just found the way!!!!

In frustration after reading this post, I banged my P110 really really hard on the kitchen worktop once on every side except for the one with the pins.

IT ONLY BL00DY WORKS AGAIN,

Not an ideal solution ny any means, but tried and tested I guess and better than the bin.

Gonna find my other ones and bang them now.

Cheers all hope this helps!

  @EdB79 Unfortunately I fear you will find this only a temporary solution as what causes this creates physical damage to the relay contacts. They are likely to skick again with increasing regularity :-(

  @mbdmbd 

Hello,

I have the same problem you report for a P105 socket and searching on the internet I found this video that might help you solve. Good luck.

https://www.youtube.com/watch?v=99iAK1JeAeo 

I see UK stock is low/unavailable at the moment...  I'm not sure if that's just Xmas and people using them for lights etc. or if it's connected to manufacturing/reliability? 
I'm just about to buy some P110s but have started to get put off by the failure posts :( 

  @mbdmbd Or maybe getting ready to make only the Matter compatible one available moving forwards

  @mbdmbd 
Same problem. Same solutions so far, I had seen the video that @HopeIT had posted a few weeks ago and opened mine up, Interestingly the relay(Black) in that video is different to the one I had opened (light blue), stoopidly i didn't photo it before cracking it open to see the state of the contacts, I haven't got around opening my other faulty one yet.
I did replace one with Tp link about a year ago as   @mbdmbd  did and what a complete pain in the ar53 that procedure was, probably by design, not only that but swapping out is a pain because you have to reprogram with Home Assistant or what every you use for home automation.
I will crack open the other one I have and find a replacement relay i think. They are a pain to open but if i buy a pack of relays i will only have to do it once per plug as they fail, I have about 20 of the buggers.
Great while they work - not worth what i paid when they fail.