If you want to parse out the interceptions you can throw out the last one, because it came with under a minute left and the Broncos down by a Bazillion points. But, the other three were making reads or bad throws or poor decisions. He ignored check down receivers who were open and tried to force a pass into coverage while throwing off his back foot on a blitz.
And the RBs didn't block anybody letting a defender come completely free.
I'm not going to roast Lock over one bad game, but he's had several bad games in a row and it's not getting better.
And now they're facing the Dolphins who have won 5 games in a row and their defense is one of the best at sacks in the NFL.
This is not a recipe for success. I'd pull Lock and let him rest his ribs for a game.