Electrical issues in house less than 18 mos old
You're frying a bunch of 120V electrical equipment.  Undervoltage doesn't fry equipment. Overvoltage does! 

This is a lost neutral problem

It may be that way from the power company from the power drop.  In which case it would not be the electricians' fault, except they should have detected it.  

Your house has two electrical poles or phases coming in.  Any modern panel will separate them like this, so it's a little byzantine (especially with double-stuff breakers) but it's possible to decode.   Anyway, you want to find two receptacle circuits on opposite poles.   Measure their voltages. 

119.3/119.9  -- that is pretty normal.  However if you see

105.2/133.4 -- that is the indication of a lost neutral. 

The surest way to flush out a lost neutral is to measure one pole while you put a big fat 120V load like a hair dryer on the other.  The dead giveaway of a lost neutral, is the unloaded leg will go up in voltage by several volts or more. 

It's possibly from the power company.  The result is half your circuits are getting too much voltage, half get too little, and this changes frequently as loads change.   

I have seen lost neutral issues affect several houses at once.