Not quite sure how long this has been happening for as I normally set and forget my individual tactics, but I've been noticing that multiple of my players tendencies are being reset to default.
This tends to get frustrating as I notice their game ratings dipping (I'm assuming the individual tactics affect this, and it's not just placebo on my end

)
FYI - These players have not been traded, called-up/sent-down or sent on the injured list, they've remained on my roster for many seasons.