|One would hope noticeably longer than 2yrs...|
Which having said.. I have a selection of Devolo 85Mbps modules; youngest is about 2yrs old; oldest several year old.
I have had one go down from my first batch of five - after about five years use; won't light up; and the internal fuse is OK...
But the rest are still OK.
Check to see if there is an internal fuse on your TP module; it may be no more than that which hath failed and can be easily replaced (use a slo-blow/anti-surge type).