Hi Keshav,
Thank you for your post.We always like hearing back from our clients.
Could you please let us know what is the load that you are switching? ( LED lamps or incandescent lights)
Over the three years in South Africa we have had a lot of Eskom power cuts and surges. This could effect the electronic in the receiver. The main component effected is the capacitor.
Please note that the QS-R-S5 relay is for resistive loads. If you are using LED loads that is a inductive load, this will over sometime have issue on switching.
The correct product to use with LED loads is the QS-R-DOPTO. This is a 2 in 1 receiver that can switch on/off and dim both LED and incandescent lamps.
If you would like your old QS-R-S5 relays to be repaired. Please courier them to us and we can inspect & quote you.