Yesterday I started the "Battle of Rishi" FP on SOLO mode and everything was going fine until I leveled up inside the FP from lvl 57 to lvl 58 and at that moment the droid vanished and did not come back. The FP still said SOLO but there was no droid. I tried all I could think of. I left the instance, went back in, no droid. I abandoned the FP, reset the mission, got the SOLO mode again from the NPC, walked in the instance and was right back where I was when the droid vanished and I still had no droid. I logged out and then in and still the same thing. I was always back where I left off with no droid. I finally just had to take the regular tactical mission and just use group finder.