but anyone that understands the 'bathtub curve' will know that if a new piece of equipment is going to fail, it is most likely to do so very shortly after powering up (e.g. within a few hours).
My brand new units:
2 T17+ died within 2 months.
1 T17e died within 6 months.
And as for the environmental temperatures it all happened during the winter so no worries on that side. I wish you good luck with those honestly.