I found a solution that worked for me and successfully got my 5 lvl reboots today that saved. Hacked of course.
Once your in a ranked lobby that people are waiting for the game to start, quickly do the nanosuit reboot before the match starts. Now just play the round until that game ends and your stats should save.
NOTE: Leaving, disconnecting, errors, kicks, etc.. in the middle of the match wont save your stats.