Mm, odd stuff. I was flying into combat in an Odachi-class, and I fielded a Kabuto-class during initial deployment. Both ships are pretty big, about the same size, and one is classed a battleship. The Kabuto was the one that had its engines burn out during (or possibly right after?) the speed boost. I happened to see that because it deployed right next to my flagship of that battle, the Odachi. The other instance of this happening to me was with me flying the Odachi itself, a bit earlier on. I'm not sure if it burnt out during or right after the speed boost in either case, though if I was to hazard a guess I'd say this issue might've been in it burning out right as it started decelerating. Haven't seen anything like this happen since I posted the topic, but I'll keep an eye out as usual.
Spoiler
name,id,designation,system id,fleet pts,hitpoints,armor rating,max flux,8/6/5/4%,flux dissipation,ordnance points,max speed,acceleration,deceleration,max turn rate,turn acceleration,mass,shield type,defense id,shield arc,shield upkeep,shield efficiency,phase cost,phase upkeep,min crew,max crew,cargo,fuel,fuel/ly,range,max burn,base value,supplies/day,repair %/day,repair cost,CR to deploy,peak CR sec,CR loss/sec,hints,number
Kabuto,bushi_kabuto,Carrier,bushi_bomber_wing,22,10000,1100,15000,16500,750,275,30,15,10,7,5,3000,OMNI,,235,0.4,0.9,,,350,800,350,500,10,45,3,100000,15,5,500,30,,,CARRIER,77777
Odachi,bushi_odachi,Battleship,burndrive,28,18000,1500,25000,31250,1250,330,30,15,10,5,5,3500,OMNI,,235,0.4,0.8,,,400,800,400,600,20,35,3,150000,15,5,500,25,,,,77777