Well there is a lot to tell about this subject.
Not sure whether someone is interested but just skip it if you don't.
Taking your electronic gear from warm to cold and vice versa is basically known as a "burn in test".
Standard procedure for any new designed piece of avionics in our aviation world where you want to know how well the device works after 15 years or so.
Of course you can't wait that long so the idea is to make it 15 year older in a day or so.
This is normally done in a temperature chamber by means of a predefined cycle: room temp, warm(70 deg.) and cold(-40 or so) and so on for a number of times while the device is hooked up and in operational condition.
The stretching and shrinking is responsible for the ageing process.
In other words Andz, you leave with new gear and will come back with very much second hand
Have a good time,