Garage replaced:hazards unit,flasher & windshield speed variator cleanign arms on 2002 Chevrolet Malibu

After a while good working... these failed : no more flashing neither left or right; hazards go on good working.
The right arm for cleaning window just operate on two highest speed, none action when pushing for liquid on glasses.
Should it be a good idea to disconnect battery for 10 minutes, what about this way of doing...for what problems ?

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