Iran's Fajr satellite has decayed mysteriously

[SuperFastJellyfish]

Okay, I have learnt that the issue was not due to the thruster firing the wrong way, if fact the thruster was never fired for some reason (one theory is thermodynamics breaking pipes). This leaves the important question of how it decayed in less the a month when the previous satellite Navid lasted 2 months at the same altitude. My guess is solar winds.

Well, breaking pipes would signify to me that something would be vented creating thrust.

[Airlock]

Another recent and mysterious satellite loss.

A 20-year-old military weather satellite apparently exploded in orbit Feb. 3 following what the U.S. Air Force described as a sudden temperature spike.

[Kryten]

Not too uncommon with hypergolic propulsion systems, thought it's usually rocket stages rather than actual satellites. 30 years of nitrogen tet corrosion-->impingement on hydrazine/MMH/UDMH tank-->boom.