but turkey often have problem with their players, and stars targeting for privileges. Talent wise your roster was easily top 5 in europe for years, but the result was often not as good(and i believe also with different coaches). So i think it is more a problem of the whole organisation, or maybe the target the player had when they join the NT team(which could be spreading through them, also at the next meeting and you can not exchange the whole roster).
That just wild guessing, but i think your team just haven't problems to focus last year because home court/ground is so special at big tournament and now the problems come back. And normally you had coaches who show their qualities before they take care of the NT, so i don't think that they got stupid when they had the job.