- magnetron is veteran or elite
- vehicle or building fires on the magnetron (so it's the magnetron which is guilty)
I've made a lot of rules editing, amongst:
veteran/elite abilities in the [General] section (I didn't touch sight)
What could cause it?

The magnetron weapons are not edited.
EDIT:
The IE doesn't happen all the time (in 80% cases) especially when the magnetron and the tesla coil fire simultaneously; and it happens just when (after) the enemy shoots as if the magnetron would want to fire back and this causes the IE.
EDIT:
I put back veterancy settings and it still happens...