correct as is AIM-120 Fails to Guide On Target After Track Loss Even Though Target is Within Seeker FOV

[DCS FIGHTER PILOT]

It is my understanding that if a track file is lost/dropped while an AMRAAM, SD-10, R-77, or Aim-54 is in flight, the missile will guide to the last known estimated location of the target at the time of pitbull. In game as of now, this is also true even if the track is reacquired. I suppose the older radars and missiles that are modeled in DCS currently do not have the ability to reengage lost contacts.  Fine, I guess. The problem is, if a track is lost while a fox 3 is in flight, even if the target makes a very slight deviation from its original course, the missile will fail to track. 

 

In the track below, I fire on a target with both an Aim-120B and Aim-120C-5, the track is lost due to the excessively harsh lookdown penalty (another issue all together) and the missiles fail to track the target even though it made a slight deviation. 

AMRAAM No Track.trk

[Маэстро]

In your track target noticabley change its velocity - that's the reason of tracking fail. See discussion here for example 

Maybe we change speed of seeker gates opening later for unsupprted shots.

Also note that AMRAAM model uses completely different technology and it's not correct to put all these missiles in one basket.