Yep, sounds like an electrical issue. Highly unlikely you'd have 3
units in a row with the exact same problem. I suspect the power is
intermittently going out in that outlet. What you might do is plug an
electric clock into that outlet - the EXACT same outlet the
fridge/freezer is plugged into. A few hours later, look and see what
time is on the clock. If it's 2 hours behind, that means the
electricity went off for 2 hours. You get the picture...