Too many booking in 7th season

So I'm in my 7th season as Man Utd manager. Much the same squad as last few seasons, nothing much has changed, except Assistant Manager and a new coach or 2. All of a sudden, I'm getting fines for too many bookings, more players sent off, overall discipline got worse. Around the same time as I started this season, the latest update (16.3.0 776772 (m.e v1632)) from SI came out. Has anyone else had problems with too many bookings since the latest update? Or is it just my game, and a change of staff and possibly their training methods has had an impact?

your tactics and players are the only things that would affect how many bookings you get, nothing to do with the update as i haven't had those issues in my save...

But I haven't changed tactics. And it's the same players getting more bookings than before.

Paul Pogba, for example, has gone from P 42(5), 14 Y, 0 R, to P 22, 15 Y, 0 R. The same amount of bookings in half the matches.
Pierrick Vaillant (Newgen) P 31, 1 Y, 0 R last season. P26, 10 Y, 0 R so far this season.

The only difference is Brian McClair left as Ass Man, I promoted Nicky Butt, and one coach retired, another 2 brought in. Training is the same (albeit coaches swapped around a bit), tactics the same, but the same players as before getting more bookings.

Maybe as the season plays out it'll start to even out a bit. Or as these players are getting older they are getting more clumsy