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Try installing a surge buster , you are probably getting lots of spikes and small surges in the AC and these are damaging sensitive ICs in the above appliances.
Brown outs don't help either as the powerfactor takes a few seconds to settle down , meaning too much inductive or capacitive component in the 3 phase AC , this is unhealthy for sensitive ICs too.
We have surge busters on the TV, HiFi , the computers , but not on the washing machine, freezer, fridges, oven and regularly have IC problems with the washing machine.
The fridges and freezer have been fine, but the oven goes ga ga regularly , have to reset the mains power to fix it.
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