I have had a tethered chargemaster unit for almost 3 years now and completed at least 1,000 charging cycles, we have a PHEV with a tiny battery so have to charge at least once a day, sometimes 3 times a day at weekends. It has been very reliable but starting last week problems started. It seems the car is recognising the cable it connected but the charging does not begin. I have reset the charger from the fusebox but that does not always seem to be the issue. Today I just had to plug it in and unplug it 3 times until it started charging, but I did not have to reset the fuse. Also, to check if there was a problem with the tethered cable I switched to the granny cable which we only used for the first week of ownership and that worked first time, which suggests a problem with the tethered cable. Do these chargers have a lifespan? Is 1,000 cycles considered to be a lot? Someone has recommended to me to use a WD-40 electrical connector cleaner. Anyone else had problems with their chargemaster box?