I've noticed it as well.
I've played different saves from the first 12.0 patch, same training programs, same players (I always take PSG), best coaches I can afford, good training facilities, big squad turn over and players taken off around 75% condition in game...
I'm in October 2011, so still in the 1st season and I already got Maxwell out for 6 month, Matuidi 4 month, M'bengue 3 month, Nene 2 month, Thiago Motta 2 month, Bisevac, Bodmer 5 weeks, Afellay, Willian, Lugano 4 weeks, Alex, Kara 2 weeks... And I'm not talking about all minor injuries!
I tried to understand where it came from as those players aren't injury prone (Ganso, Pato...): quite hard to get it as it happened during international games, Ligue 1/Europa league games, during training (set to average), players hurting teammates...
As I said before, I always manage PSG from the first CM/FM opus and know very well my squad. Always trained them individually and I've never experienced something like that before!!! So it's either me being unlucky in this save or something about injuries has definitely changed in the last 12.2.0/1. patch