Don't worry about the Decabit device, it's a ripple relay that allows the supply authority to shed the load of your geyser during peak usage times. Decabit refers to the type of signal that's injected into the high voltage supply at source so it's definately a remotely operated loadshedding relay.
If you have a very old earth leakage unit or even a VOELCB then it's possible it's just nuisance tripping when there an arc. This however is fairly unlikely and the frst step is to do some insulation testing on the installation and the items that are plugged in or otherwise connected. There's little other option than to find yourself an experianced electrician who has the approprate test equipment.
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