When creating Mines, be careful what you add to them; I made mine too big apparently, and if I drop them behind while going too slow/stopped, they instantly die.
The problem was that I used Forcefields to make a round base and some half-circle stands & glued them to the weapon to try and help my Mine land up-right all the time. Shrinking the whole object kept it from dying when spawned from a standstill.
"The best things in life must be taken... by force!" ~Captain Khan