Bad update

This update has really messed my game up.   I've been pc gaming for over 20 years. 

1. First all my in game settings were completely messed up.  Took me almost 45 minutes to reset everything.
2. While in game,  the game started to switch from my primary rifle to my melee weapon.   I did not touch and ket but forward and sprint,  and it would automatically change from my rifle to my sledgehammer.   Even while taking a point in conquest,  it would switch from my rifle to the sledgehammer.   I died multiple times trying to shoot a player with the sledgehammer.   I finally had to quit because it was too frustrating. 
3. All the other updates did great but this one is awful