i was trying to develop a 2.5m in my carreer rocket capable to recover every single component (except for some fairings or decoupler), and i simulated the lauch. the plan was to lauch it out of the atmosphere, and than detach the payload and circularize with the second stage. when the payload reaches orbit, i switch to the first stage, that is still out of the atmophere, re-enter and land safely. but as soon as i stry to switch the rocket explodes look at the alitude i don't know if the problem is of the mod (because i did this in a simulation), or is the rocket itself. P.S. sorry if there are a lot of grammatic errors, i'm not english, i'm italian