If there is a problem and they are not all that unusual really. Plus to be absolutely clear. With a semi floating neutral you can experience say 140 volts on one leg and 90 volts or so on the other for example.

Normally both legs to neutral should be about the same voltage. If oxidation is present at a neutrals terminal it can change the individual legs voltage with it's resistance that may also vary with heating or loading. You want to measure that voltage with some electrical load on one side. Just a 1000-1500 watt 110 volt electrical heater plugged in anywhere in the house or some equivelant is fine,.

In the old days I never broke the neutral into two wires at the meter socket. Always just stripped the white or neutral enterance wire that contacted that area and fed one piece of wire down through so the neutral was never in two pieces going through the meter socket.

Then I got older with more contorted installations using aluminium wire. Was just a little too hard to do it that way so I break the neutral now on occasion. Personally I still do not like the practice.

This practice has resulted in oxidation problems in meter sockets causing some issues with older ones I did not install so far. Oxidation at a neutral termination can cause the semi floating neutral.

The local hydro people do not seem to care if I break meter seals on my properties. They just replace them when they notice. I think they are well aware that I do not steal electricity is a help.

Since you have other troubles or at least suspected ones. The fridge will probably check out okay. To me though with my limited abilities and knowledge. The fridge is always the first thing to eliminate if higher than normal power bills are present. Then you move on to other things.

I am not a working electrician and technically you need a licence here. So I just get a friendly electrician to get whatever permits are required and do just what I own or am building.

The electrician feels that I am competent enough and will cause him no grief. Other than that people that have heard I can run down problems call me a couple of times a year on average.

If your wife for example ever claims to get a slight tingle off of an appliance always take is seriously. Not from the aspect of getting electrocuted it just indicates something is going on that should be examined.

There are some much more competent members than myself on site that will also help you run down any electrical issues.